3. In cats, the B allele codes for black fur, and the b allele codes for...
3. In cats, the B allele codes for black fur, and the b allele codes for orange fur. The gene is located on the X chromosome. However, the genotype XB/Xb results in fur with a mottled appearance called tortoise-shell. Suppose a tortoise-shell female is crossed with a black male.
a. What are the parental genotypes?
b. What phenotypic ratios would be expected in the offspring?
c. What is the mode of inheritance?
d. A rich client wants a tortoise-shell male. Can you deliver?
Homework Answers
ANSWER :
a) The genotype for the black fur male and tortoise shell female cat are XB YB and XB Xb respectively.
b) In the given case, phenotypic ratio of fur colour in the offsprings of first generation would be 1:1:1:1, which related to XB XB (black female), XB Y (black male), XB Xb (tortoise shell colour female) and Xb Y ( orange fur male) respectively.
c) The fur colour in cat is inherited in offsprings via incomplete type of dominance since allelic pairs are not capable to show a definite trait.
d) The tortoise shell male cat would not be obtain via cross of black fur male and tortoise shell female parents, only tortoise shell female (XB Xb) can be obtained
Add Answer to:
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