Human Heredity: Principles and Issues (MindTap Course List)
11th Edition
ISBN: 9781305251052
Author: Michael Cummings
Publisher: Cengage Learning
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Textbook Question
Chapter 7, Problem 4QP
A Survey of Human Development from Fertilization to Birth
4. The gestation of a fetus occurs over 9 months and is divided into three trimesters. Describe the major events that occur in each trimester. Is there a point at which the fetus becomes more “human”?
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Stages in Embryonic Development
1. The heart begins to beat.
2. Inner cell mass differentiates into three germ layers.
3. Mitosis leads to a 100-cell mass.
4. Implantation occurs in the endometrium.
The embryonic developments listed above occur in the sequence
and
Stages in Fetal Development
1. First trimester
2. Second trimester
3. Third trimester
Match four of the fetal developments listed below with the appropriate trimester numbered
above.
Fetal Development
Number
Heart is formed and begins to pump.
Bone marrow is only site of red blood cell production.
Heartbeat can be heard with a stethoscope.
Yolk sac produces the blood cells.
Some Events in the Process of Fertilization
1. A single sperm nucleus and an egg nucleus fuse to form a zygote.
2. Many sperm cells travel a path through the outer layer of the egg cell.
3. The egg's plasma membrane is penetrated by a sperm cell.
4. A rapid depolarization of the egg plasma membrane occurs.
The correct sequence to complete the fertilization of the egg is
,and
Chapter 7 Solutions
Human Heredity: Principles and Issues (MindTap Course List)
Ch. 7.6 - Prob. 1EGCh. 7.6 - Prob. 2EGCh. 7 - As outlined in this chapter, sex can be defined at...Ch. 7 - As outlined in this chapter, sex can be defined at...Ch. 7 - Prob. 1QPCh. 7 - The Human Reproductive System Discuss and compare...Ch. 7 - Prob. 3QPCh. 7 - A Survey of Human Development from Fertilization...Ch. 7 - Prob. 5QPCh. 7 - Prob. 6QP
Ch. 7 - Prob. 7QPCh. 7 - How Is Sex Determined? The absence of a Y...Ch. 7 - Prob. 9QPCh. 7 - Mutations Can Uncouple Chromosomal Sex from...Ch. 7 - Prob. 11QPCh. 7 - Mutations Can Uncouple chromosomal Sex from...Ch. 7 - Prob. 13QPCh. 7 - Sex-Influenced and Sex-Limited Traits What method...Ch. 7 - Prob. 15QPCh. 7 - Prob. 16QPCh. 7 - Equalizing the Expression of X Chromosome Genes in...Ch. 7 - Equalizing the Expression of X Chromosome Genes in...Ch. 7 - Equalizing the Expression of X Chromosome Genes in...
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- Major organs begin to develop during which part of human gestation? fertilization first trimester second trimester third trimesterarrow_forwardThe placenta is formed from ________. the embryos mesenchymal cells the mothers endometrium only the mothers endometrium and the embryos chorionic membrane the mothers endometrium and the embryos umbilical cordarrow_forwardThe ________, a fluid-filled sac, surrounds and protects a human embryo and keeps it from drying out. a. amnion b. yolk sac c. allantois d. chorionarrow_forward
- Nutrient and waste requirements for the developing fetus are handled during the first few weeks by: the placenta diffusion through the endometrium the chorion the blastocystarrow_forwardWhat would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst? Tire cells would not continue to divide. Tire corpus luteum would continue to produce progesterone and estrogen. Menses would flush the blastocyst out of the uterus. Tire uterine mucosa would not envelop the blastocyst.arrow_forwardHuman Development and Birth 1. Where does the process of gastrulation occur? 2. What structure, located under the placenta, is responsible for oxygen and nutrient acquisition for the developing human?arrow_forward
- Trimester Milestone First Second Grow Grow +Lungsarrow_forwardThe approximately nine month. Between fertilization and birth or transforms a single cell into a complete human being. Test your knowledge of the events that occur in each stage by highlighting the events of the pre-embryonic stage and pink the events of the embryonic stage and blue and the events of the fetal stage in yellow.arrow_forwardTrophoblast or ICM? If cells choose to become trophoblast, they will end up in the placenta. If they choose to become ICM, they will give rise to the 3 germ layers that will make up the rest of the body of the embryo. Answer the following questions: What will guide them to make the right decision? Do they have a choice?arrow_forward
- Prenatal development is the time from fertilization to birth and includes both embryonic and fetal periods. It is divided into period of three calendar months called trimester. Describe the major events of each trimester.arrow_forwardDescribe the features and process of a fetus embryo at 10 weeks of pregnancy.arrow_forwardVertebrate Fertilized Class Blastula or Blastocyst Late Morula Gastrula Egg Embryo Amphibian Reptile Mammal How long after ovulation does it take an embryo to develop? The resulting embryo may become the (attached) in the lining of After eight weeks of development the embryo is called the How long does it takes the fetus to develop and grow inside the mother? What is differentiation? The embryo continues dividing and form all the tissues organs and organ systems of the animal When should pregnant mother take most precaution?arrow_forward
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