Question 4 Answer each question on a separate page of paper. For questions 1-3 s

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Question 4 Answer each question on a separate page of paper. For questions 1-3 show calculations. can be answered with a couple of sentences. Write your name on each page. Extra credit will result in up to a reduction of 40% of the points off on your exam. Partial credit Several genes control flower color in the (imaginary) Bogo plant. Red petal is dominant to white, Smooth edged petal is dominant to feather edged, Long petal is dominant to short; and 7 petal flower is dominant to petal flower. Suppose a true breeding Red Feathered Long 5 petal plant was mated with a White smooth short 7 petal plant to generate a tetrahybrid. When the tetrahybrid plant progeny were obtained. If any of these genes are linked -draw a genetic map to indicate distances separating the linked loci. 1. was testcrossed the following the genetic White, Feathered, Short, 7171 Red, Feathered, Long. 5 Red, Smooth, Long, 5 White, Smooth, Short, 7 Red, Smooth, Long, 7 White, Smooth, Short, 5 White, Feathered, Short, 5 Red, Feathered, Long,7 White, Feathered Long, 727 Red, Feathered, Short, 5 Red, Smooth, Short, 5 White, Smooth, Long, 7 Red, Short, Feathered, 7 White, Long. Feathered, 5 Short, Smooth, Red, 71 170 164 163 57 53 26 24 23 In rabbits, two genes control fur pigmentation. At the color locus, the Grey allele is dominant to the tan allele and at the Albino locus, pigmented fur is dominant to pigment-less (albino) fur. Rabbits homozygous recessive at the albino locus have albino fur no matter what the genotype is at the color locus. The Grey and Albino loc are both on chromosome two- 20 map units apart. 2. A homozygous Tan rabbit was mated with a homozygous Albino rabbit. All the F1 rabbits had grey fur. What phenotypic ratio would you expect in the F2 generation? (Remember the genes are linked) 3. Ocular albinism is a recessive X-linked trait that causes a lack of pigment in the iris of the eye. This results in very pale grey-blue eyes. The lack of pigment associated also causes partial blindness. Suppose a man with ocular albinism has children with a brown eyed woman whose father had ocular albinism. What is the likelihood their children will lack pigment in their retina? Will the ratio be different between male and female children? 4 This pedigree shows the inheritances of an Referring to the data in this pedigree. A. Describe is the clearest evidence that this trait is dominant? B. Describe is the clearest evidence that the trait is X linked? (Hint: linked dominant trait. the answer to this involves the trait being dominant)

Explanation / Answer

ans no-4

A- the disorder is dominant because in all of the cases where offsprings are affected by the disorder , one of there parents have the disorder. if it would have been recessive  neither parent has to have the disorder because they can be heterozygous.

B- If most of the males in the pedigree are affected, then the disorder is X-linked .Both males and females are affected; often more females than males are affected ,does not skip generations.

Affected sons must have an affected mother; and affected daughters must have either an affected mother or an affected father .

Affected fathers will pass the trait on to all their daughters and affected mothers if heterozygous will pass the trait on to 1/2 of their sons and 1/2 of their daughters

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