In rats, the allele for kinky hair (h) is recessive to the allele for normal hai
ID: 167344 • Letter: I
Question
In rats, the allele for kinky hair (h) is recessive to the allele for normal hair (H), and the allele for short tail (t) is recessive to the allele for long tail (T). The genes for hair kinkiness and tail length are found close together on the same chromosome (they are linked).
"Backalley Bob" is a rat who is heterozygous for both hair type and tail length. (Important information: Bob's father had kinky hair and a long tail, and was homozygous for both traits). Bob met and married "Riverboat Rita", a kinky-haired, short tailed rat.
a. Give the genotype for each of the following:
Backalley Bob:
Backalley Bob's father:
Riverboat Rita:
b. Draw a Punnett square to illustrate the cross between Backalley Bob and Riverboat Rita. Remember - the genes are linked. Assume that there is no crossing over.
c. Give the predicted genotypic ratio of the offspring of this cross, if there is no crossing over.
d. Draw a chromosome diagram to show Backalley Bob's cell in Metaphase I of meiosis. Assime no corssovers have occured. Label alleles on each chromatid you draw.
Explanation / Answer
Answer:
a). The genotype for each of the following:
Backalley Bob: hT/Ht
Backalley Bob's father: hT/hT
Riverboat Rita: ht/ht
b).
hT/Ht X ht/ht
c). kinky hair & Long tail, 50% : Normal hair & short tail, 50%
ht hT hT/ht (kinky hair & Long tail) 50% Ht Ht/ht (normal hair & short tail) 50%Related Questions
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