Question 5 Listen Genes A and B are very close to each other on a chromosome. The dominant allele A is normal pigmentation while the recessive allele a results in albinism The dominant B results in normal size ears, while the recessive allele b results in big ears. You take organisms of genotype Ab/aB and cross them to ones which are ab/ab. Which of the following will be the rarest class of offspring? a) Normal pigmentation, big ears b) Normal pigmentation, normal sized ears c) Albino pigmentation, normal sized ears d) All of the above will be equally likely to occur
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- QUESTION 8 A researcher is trying to determine the relationship between the A gene and 3 other genes (B, C and D). She performs three test crosses to determine if the genes are unlinked, incompletely linked or completely linked. Next to each cross is the ratio for the progeny of the cross. In the 3rd column please indicate whether the gene pair being tested is unlinked, incompletely linked or completely linked. Ratio (Alleles indicate phenotype of progeny) Type of Linkage (incompletely linked, completely linked or unlinked) Crosses AaBb x aabb 1 AB: 1 Ab: 1 aB: 1 ab AaCc x aacc 6 AC: 6 ac: 1 Ac: 1 aC AaDd x aacc 1 AD: 1 adQuestion 1 You are doing a genetics experiment with the fruit fly. In the "P" generation, you cross two true-breeding flies. The female parent is brown and wingless and the male parent is black with normal wings. All of the flies in the F1 generation are brown and have normal wings. Indicate the alleles associated with dominant phenotypes by uppercase letters and alleles associated with recessive phenotypes by lowercase letters. Assume the genes are not found on a sex chromosome. Indicate the color alleles as "B" and "b" the wing alleles by the letters "N" and "n". a) The genotypes of the flies in the P generation are: female and male. b) The genotype of the flies in the F1 generation is: c) You now take an F1 female and cross her to a true-breeding black, wingless male. This male's genotype is: d) You count 1600 offspring in the F2 generation. If the wing and the color traits were linked and no recombination occurred, you would expect to count: # of brown, winged flies (of the…QUESTION 7 A trihybrid individual with the genotype AaDdEe is testcrossed with an aaddee individual. The resulting offspring are as follows: ADe 880 aDE 67 AdE 45 ade 4 ADE 3 aDe 57 Ade 57 adE 887 Total = 2000 a) Determine the allele arrangement and gene order in the trihybrid parent. Give your answer using the PQr/pqR notation. b) Draw a chromosome map for these genes. Give your map distances to two decimal places. (Use underline or underscore (_) to draw the line for the map)
- Question 6 Albinism is caused by an autosomal recessive allele that interferes with skin pigmentation in mammals. Two normally pigmented human parents already have an albino boy. They plan to continue to have children until they get a girl. Some or all of this information is important for each of the questions below. a) What is the probability that their next child (currently unborn) will be a girl with albinism? Explain your reasoning. b) What is the probability their first female child will be albino? Explain your reasoning. c) The answer to part (b) is different (and, yes, the answer is different) from the answer to part (a). Explain why. (Hint: it has something to do with the underlined words.)QUESTION 1 In cats, there is a gene that determines how saturated the coat color is. The full color allele (D) is dominant to dilute color (d). You have a full-colored female cat, Catniss, and want to know if she is homozygous for the D allele or whether she is heterozygous. You decide to perform a test cross to determine the genotype of your cat (you have lots of friends interested in adopting a kitten). Your full-colored cat, Catniss, should be crossed to a male cat with what genotype? Some of the kittens are full-colored and some of the kittens are dilute. What is the genotype of the full-colored kittens? You decide to cross your full-colored cat, Catniss, to a male that is heterozygous for the D gene. The first kitten is born and is full-colored. What is the probability that this kitten is homozygous for the D allele? udy M $ E R 96 5 Antof T Q Search 40 6 Y & 7 C 8 144 ( 9 8 O O P [ delete backspace *40 home num locke 7:08 1/31/2Question 17 You and your laboratory partner began to conduct a dihybrid cross of pea plants before the pandemic, using two traits that sort independently. The traits you studied were leaf shape (S-smooth, s=ridgy) and leaf color (C-green, c=red). You and your lab partner put on your masks and took a socially distanced trip to see your experiment in the greenhouse, where you counted 112 plants from the F1 generation of your experiment. As you expected, every plant in the F1 had smooth, green leaves. What are the allele frequencies in the F1 generation of your experiment? A Ss=50%, Cc=50% B S=25%, s=25%, C=25%, c=25% C) S=50%, s=50%, C=50%, c=50% Ss=100%, Cc=100% Last saved 1:29. 52 minutes remaining P Type here to search Home PrtScn F8 *3 F2 DII F3 Esc F5 F6 F7 23 $ % 2 3. 4 6.
- QUESTION 18 Pure-breeding ancient varieties of chickpeas can be black, brown, green or red in color. A new tan colored chickpea was isolated and shown to be pure-breeding. To determine the genetic basis of color inheritance in chickpea many crosses were made between the various varieties. The results are shown in the table below. Cross F1 phenotype F2 offspring ratio Cross F1 phenotype F2 offspring ratio black x brown % black % brown all black brown x red all red % red % brown black x green all green % green % black brown x tan all tan % tan % brown black x red all black % black % red green x red all green % green % red black x tan all black % black % tan green x tan all green % green % tan brown x green all green % green % brown red x tan all pink % red % pink %. tan A. Analysis of the F2 offspring indicates that a single gene locus determines skin color in chickpea. Explain why? B. From the choices below, determine which mode of inheritance controls chickpea skin color in the ancient…Question 12 You are investigating gene interaction in guinea pigs. When you cross two heterozygous wild type black guinea piega you get 12. offspring in total, 18 wild type black guinea pigs and 14 mutant white guinea pigs. What kind of interaction are the genes governing fur color displaying here? O Recessive epistasis O No interaction Pleiotropy O Complementary O Dominant epistasisQuestion 3 Anna (who produces eggs) and Syed (who produces sperm), have a child with Down's syndrome that results from trisomy of chromosome 21. Using a microsatellite sequence on chromosome 21, you run a gel. The gel imaged is attached; darker bands indicate signals of twice the intensity. If a nondisjunction event occurred in Anna during meiosis I, which lane (A, B, C, D) best fits the genotype of their child? Explain your choice, clearly identifying why that lane is correct and why the other lanes are incorrect. Assume no recombination.
- QUESTION 1 The picture below represents a G1 cell from a newly discovered species that uses the X/Y sex determination system. Alleles for the different autosomal genes of interest are indicated on the chromosomes, and genes R and T are 16 cM apart. Red lines show maternal chromosomes, and blue lines show paternal chromosomes. Answer the following questions about this individual. R r KK a) Name any two loci in this individual that can result in recombination in the gametes via the process of crossing over. b) What is the sex of this individual? Justify your answer. c) Give the term that will describe the morphology of the that carries the N alleles. d) Provide the genotype of the fertilizing male gamete that produced this individual. e) This individual can produce a pool of different gametes. List any TWO potential gametes that will occur at different frequencies. Give the alleles of each gamete contained within a set of brackets, and indicate the expected frequency (up to two decimals)…Question 1 In a particular country in sub-Saharan Africa, a medical study revealed that 0.075% of the country's population are suffering from sickle-cell anaemia. Sickle cell disease is caused by a mutation in the haemoglobin-Beta gene found on chromosome 11. Sickle cell anaemia is controlled by a pair of alleles, H and h, where the individuals with the illness have the homozygous recessive genotype; those with normal red blood cells have the alternative genotype. Using the Hardy-Weinberg's equation, calculate the percentage of the population of the two genotypes for normal blood cells. In a few remote areas in that country, the percentage of sickle cell anaemia reaches as high as 5%. Calculate the percentage of homozygous and heterozygous individuals with the normal blood cells and find the ratio for both phenotypes. Discuss whether blood cells go through mitosis.QUESTION 4 Crossing-over is all of the following EXCEPT O A. rearranging genes to combine some of a person's mother's and father's DNA into an inheritable strand O B. a process that happens only in Prophase I O C.a problem that makes it less likely that our species will survive O D. a reason why there is great variety in eggs and sperm and diversity among individuals of the same species