Q: What are morphogens, exactly? Explain how they affect the patterning of tissue throughout embryonic…
A: Pattern formation is a development process by which the cells acquired different identities…
Q: What is the molecular explanation for maternal effect?a. The father’s gene is silenced at…
A: The maternal-effect is the influence on the phenotypic expression in an embryo or progeny due to the…
Q: parthenogenetically
A: PARTHENOGENESIS:- Involvement of female gamete without fertilization is called parthenogenesis or…
Q: During oogenesis, oogenetic inhibitors must be deactivated after full growth to allow the
A: Since you have asked multiple question, we will solve the first question for you. If you want any…
Q: In mice, the copy of the Igf2 gene that is inherited from the mother isnever expressed in her…
A: The unit of heredity is a gene. These genes account for different phenotypic and genotypic…
Q: Invagination of the sea urchin blastulaA. is preceded by changes in the shape of individual…
A: Invagination is a process occurring during gastrulation. It includes movement of cells at the…
Q: The FOXP gene strongly affects what else, in addition to brain development? A. The stomach and…
A: Forkhead box protein P2 (FOXP or FOXP2) is a protein that is encoded by the FOXP2 gene in humans.…
Q: Group of answer choices a. control of formation of the dorsal/ventral axis in the chick b. control…
A: The zone of polarising activity ZPA is a specialised area of mesenchyme in chick embryo.
Q: 1- If a blastula splits in two and two fetuses develop, what is created? a. Fraternal Twins…
A: Identical twins are produced when a single zygote splits into two identical zygote and are called…
Q: Which statement about menopause is most correct? A. Menopause has to be adaptive because…
A: C. Several hypotheses for menopause as an adaptation have been proposed, but more evidence is…
Q: 1. There are many pathways in fertilization that remain as gray areas. Choose one of these pathways…
A: Reproduction is a basic feature of life, which is a process by which the offspring of an organism is…
Q: A chemical that prevents acrosomal proteins from interacting with proteins on the egg membrane would…
A: The binding of the sperm to the vitelline envelope of the egg is species-specific.
Q: Observations of the developing chick embryo reveal that skeletal muscles develop from the…
A: The neural crest is often termed the fourth germ layer. It develops from the neural tube from the…
Q: Menstrual change is a common symptom of uterus myoma, which of the following factors is related to…
A: Myoma means a noncancerous tumor that occurs in the uterus. Menstrual change is a common symptom of…
Q: 5. Indicate how the following perturbations affect dorsal/ventral patterning of the somites. a.…
A: Answer :: a) shh stands for Sonic hedgehog. This acts as a ligand for patched receptor. Shh are…
Q: a.) The conversion of the genital ridge into the bipotential gonad requires the Sf1, Wt1, and Lhx9…
A: Sex determination : There are certain genes which plays important role in sex determination. But…
Q: One function of the placenta in a 1 point human is to * (1) Allow nutrients to diffuse from the…
A: Placenta is the structure which is formed by both the fetus and the mother. It release the hormone…
Q: It is estimated that in about 1/150,000 births, an individual is born with 46 chromosomes, both an X…
A: Introduction: Any form of change that occurs in the DNA sequence is referred to as a mutation. A…
Q: A morphogen______ . a. is a master regulator gene b. has different effects at different…
A: Animal development is the process in which a fertilized egg undergoes cell division and cellular…
Q: Morphogenesis occurs through the multistep process of (a) differentiation (b) determination (c)…
A: Many processes are involved in shaping the microorganism and its structures where it performs the…
Q: Which of the following statements is FALSE? a. VegT and Veg1 induce both dorsal and ventral…
A: Here, we have to select the incorrect statement regarding development.
Q: Which of these is not correct ? a) In mammals,acrosome reaction occurs when sperm contacts the…
A: In the above question all options are related to fertilization. Fertilization is a process Where a…
Q: a. List the differences between infectious and genetic diseases.
A: Introduction Disease:- Any condition which impairs the health, or interferes with the normal…
Q: 10. Researchers have discovered a new compound that is a candidate for birth control. Its proposed…
A: The contraception pill (also called "the Pill") is a daily pill that contains hormones to vary the…
Q: e) None of the answers 31- Which stage of prenatal development goes from the second to the 8h week…
A: As per our company's guidelines we are supposed to answer three sub parts only. Please repost the…
Q: What is the role of the SRY gene on the Y chromosome? a. Production of Mullerian hormone proteins b.…
A:
Q: Which of the following illustrates the regulative nature of early mouse development? (a) the mouse…
A: The mouse has been used as a model organism to study the development of mammals.
Q: As shown in Figure 13-26, the Sonic hedgehog gene is expressed in many places in a developing…
A: Sonic hedgehog protein (SSH) is otherwise called as HHG-1, which is a part of hedgehog family. SHH…
Q: The zona pellucida is important in mammals because it...
A: The zona pellucida is a thick extracellular layer that covers all mammalian eggs and preimplantation…
Q: In the development of the nervous system, one of the following is false? The neural tube maintains…
A: The vertebrate nervous system is framed in embryos. neural plate: A thick, level bundle of ectoderm…
Q: 1. Which of the following layers protect the mammalian oocyte during ovulation? * a. cortical and…
A: Structure of mammalian Oocyte: mature mammalian Oocytes have many layers before ovulation- Follicle…
Q: Researchers searched for an activator of neural tissue formation. What is the real pathway for this…
A: In this question, from the given choices, we have to select the correct option for neural tissue…
Q: In an experiment described in lecture, a portion of tissue containing ZPA was transported to the…
A: Option A
Q: Describe how teratogenic agents cause the deformity of the embryo and give specific example. 2.…
A:
Q: A mutation in the control region of a Hox gene that is normally expressed in the thorax causes the…
A: Mutations are changes in the sequence of DNA which may or may not affect the phenotype of the…
Q: 1. In Deuterostomes, nutrient molecules (monomers) are taken into the space between the endoderm and…
A: Question -1. In Deuterostomes, nutrient molecules (monomers) are taken into the space between the…
Q: At which stage in development would a cell's gene expression not be altered between cell types? a)…
A: Introduction :- Developmental biology allows us to study and observe the changes that takes place…
Q: A human with the SRY gene would: a produce eggs during gametogenesis b have…
A: SRY gene is responsible for the initiation of male sex determination in mammals.
Q: The developmental pattern of C. elegans is said to be mosaic because (a) development is controlled…
A: Introduction:- The nematode worm Caenorhabditis elegans is perfect for understanding the genetic…
Q: the ectoderm of a gastrula stage vertebrate embryo, what is the major function of BMP4? a). repress…
A: Hello. Since your question has multiple parts, we will solve first question for you. If you want…
Q: 1. What is the sex of a pigeon and the crest of a pigeon a product of?
A: We are answering first question only. Fir rest of questions pls repost.
Q: 17. A researcher discovers a certain genetic disorder is appearing more often in males than in…
A: Genetics is the study of genes, their interactions, and the effect of environment on genes. Broadly…
Q: 2)Why are organisms that broadcast spawn useful for studying fertilization & development?
A: Spawning is the process of laying eggs
Q: construction worker most of his life, and has been frequently in in contact with asbestos. Wha is…
A: Note : Hi. Since you have asked many questions, we will solve first two questions, if you want us to…
Q: The expression of maternal-effect genes directly leads to a. the establishment of body axes. b.…
A: Maternal effect genes are the genes whose products are present in the fertilized egg or embryo…
Q: 2. The images below show embryos of different species at different stages of development. Label the…
A: For pregnancy to occur, sperm needs to get fused with an egg. Pregnancy formally begins when a…
Q: . Differentiation of the Spemann’s primary organizer requires which of the following?* a.…
A: Spemann’s primary organizer are the transplanted tissue of early gastrulas and its dorsal lip used…
Q: A cytoplasmic determinant can control development at the early stages of development because....?…
A: Cytoplasmic determinant Cytoplasmic determinant are very important molecules that help in the…
1. During the formation of the limb bud, the components of the zeugopodium develop in the presence of:
a. High concentrations of Fgf and low concentrations of Gli
b. High expression of Hox genes 9 and 10
c. High expression of Hox genes 10 and 11
d. Intermediate concentrations of Retinoic Acid and Wnt
e. Low concentrations of Retinoic Acid and Fgf
f. a and b
g. a and c
h. c and d
i. b and e
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
- 1. Use the following scenario to answer questions: Stimulation of G-protein coupled receptors on ovarian cells by certain pituitary hormones promotes the synthesis of estrogen and progesterone using Gαs pathways. Suppose you are studying the release of estrogen from cultured ovarian cells exposed to pituitary hormones. What effect would the following conditions have on estrogen release in response to the pituitary hormones? Genetic deletion (knockout) of Gα along with overexpression of constitutively active PKA would result in (hint: think of epistasis experiments) Answers: a. No change in estrogen release b. Increased release of estrogen c. Decreased release of estrogen d. Can not be determined 2. Imagine that you knocked out the gene encoding the anaphase inhibitor (securin) in a population of fission yeast. Would you expect these yeast cells to be smaller than normal, longer than normal or normal-sized? a. Smaller…1. Differentiation of the Spemann’s primary organizer requires which of the following?* a. transcription of nodal by tcf3. b. rotation of the cortex before fertilization. c. inhibition of disheveled protein by GSK3. d. inhibition of GSK3 to increase ß-catenin protein. 2. Which of the following types of induction is NOT exhibited during eye lens differentiation? a. instructive induction b. community induction c. reciprocal induction d. sequential induction 3. Paracrine signaling is characterized by which of the following?* a. Inducer and responder are adjacent. b. Evocators diffuse towards receptors. c. Evocators are ligand membrane proteins. d. membrane channels allow ions to diffuse between cell 4. Trithorax group proteins silence genes by* a. trimethylating histone 3 at lysine residue 2. b. trimethylating histone 4 at lysine residue 2. c. trimethylating histone 3 at lysine residue 4. d.…Describe the effects of FGF and RA on each other in limb bud development. Give a specific example of their effects on each other in this capacity. Knowing this, propose a question/hypothesis to investigate the mechanism of how a specific morphogen controls pattern if you know that the morphogen is both necessary and sufficient AND is expressed in the correct spatial/temporal frame.
- 1. After receiving the SR signal, stem cells in the developing organism will have an increased potential to specialize. The __ genes, when expressed, enable these embryonic stem cells the capacity to differentiate. A. SR B. Skin Diff C. ID D. Neural Diff E. DIV F. DET Please answer in short and ASAP .2. Choose the correct statements about the eye development A. Hh, which is expressed by the developing photoreceptors in the posterior eye disc, induces cells in the morphogenetic furrow (MF) to express DPP, which is the ligand of DPP (BMP) signaling. B. Wg and Notch signaling inhibit while Hh and DPP promote the co-expression of RD genes including Ey (Eyeless) and Eya (Eyes absent) in the preproneural (PPN) domain anterior to the MF. C. Eya, sine oculis (so), and Eyg (Eyegone) are the retinal determination (RD) network genes required for retinal determination and induction of atonal expression. D. EGFR signaling is required for the differentiation of all the photoreceptor neurons after R8 determination. In addition EGFR signaling is also required for maintaining cell survival in posterior eye discs. E. During Drosophila eye development, cell proliferation in the second mitotic wave is required to provide sufficient undifferentiated cells surrounding the differentiating photoreceptors…Which of the following is NOT true about the specification of the eye field? (Check all that apply) A ET induces RX, which in turn induces Otx2 and Pax6. B During late gastrulation, the forebrain and hindbrain are specified. Pax6 initiates the expression of a network of transcription factors, some of which mutually activate one another. D ET induces RX, which in turn induces Pax6 and blocks Otx2 within the eye field. ET induces RX, which in turn blocks Otx2 and Pax6. F During early gastrulation, Noggin promotes the expression of both ET and Otx2. During late gastrulation, Otx2 blocks the inhibition of ET by Noggin. H) It starts with neural induction when the neural plate is induced within the ectoderm. Pax6 is only required for the specification of the retina. During early gastrulation, Noggin indices Otx2 but blocks ET. E Feedback That's not correct
- In early mammalian development, compaction would likely be blocked by inhibiting expression of which of the following? a. Beta-catenin. b. E-cadherin. c. Bcl2. d. Cdx2.1. Match each of the terms in the left column to the bestfitting phrase from the right column.a. epistatic interaction 1. divide the body into identical units(segments)b. regulative 2. initiated by binding of ligand todetermination receptorc. modifier screen 3. individuals with cells of more thanone genotyped. RNAi 4. the fate of early embryonic cells canbe altered by the environmente. ectopic expression 5. assign identity to body segmentsf. homeodomain 6. substance whose concentrationdetermines cell fatesg. green fluorescent 7. suppression of gene expression byprotein double-stranded RNAh. genetic mosaics 8. method for identifying pleiotropicgenesi. segmentation genes 9. a DNA-binding motif found incertain transcription factorsj. homeotic genes 10. encode proteins that accumulate inunfertilized eggs and are needed forembryo developmentk. morphogen 11. double mutant has phenotype of oneof the two mutantsl. maternal effect 12. a gene is turned on in an inappropriategenes tissue or at…A cytoplasmic determinant can control development at the early stages of development because....? Group of answer choices a. it is a universal activator of all genes b. it is present evenly throughout the cytoplasm c. it is activated by cell division d. it is controlled by genes present in the cytoplasm e. it is laid down in the egg cell by the mother
- 1.) What is one type of cell that CANNOT arise from the differentiation of a mesenchymal stem cell? A. A neuron B. A muscle cell C. An egg cell D. A bone cell 2. there is the statement: "Both stem cells and specialized cells have all the same genes. They differ in the regulation of those genes and express very different sets of genes ". Which one of the following explanations best accounts for this difference in stem cell and specialized cell gene expression? A. Stem cells and specialized cells have different activators and repressors that affect transcription B. Stem cells and specialized cells have different promoter sequences for their genes, thus affecting transcription C. Stem cells and specialized cells have different ribosomes that affect translation D. Stem cells and specialized cells use different start codons on mRNAs, thus affecting translation1. Which of the following is NOT a characteristic of avian axis formation?*a. The anterposterior axis is established by a nodal cascade.b. The epiblast surface facing a basic environment becomes the dorsal surface.c. The epiblast surface facing a negative environment becomes the dorsal surface.d. The antero-posterior axis is established when the ovum rotates in the shell gland 2.Which of the following proteins is NOT required in the dorsalization of the vertebrate neural tube?* a. chordin b.follistatin c. noggin d. retinin 3. An induced pluripotent cell is described by which of the following?* a. It is a committed cell that undergoes redifferentiation. b. It is a committed cell that undergoes dedifferentiation. c. It is a terminally differentiated cell that undergoes redifferentiaton. d. It is a terminally differentiated cell that undergoes dedifferentiation. 4. Which of the following statements about the VegT-nodal morphogen gradient is NOT…Mutations in the BRCA genes have been shown to be related to a higher incidence of breast cancer in humans, and genetic tests are available that enable women to discover whether they carry versions of the gene associated with high risk. However, even early detection of breast cancer does not guarantee a cure. What considerations can you think of for and against advising women to take the tests? ·