Question

In crocuses the gene for plant height (Tall vs. short) is located 10 centimorgans from the...

In crocuses the gene for plant height (Tall vs. short) is located 10 centimorgans from the gene for plant hairyness (Hairy vs. hairless).

If a Tall / Hairy plant that is heterozygous for both traits is crossed with a short / hairless plant, what proportion of the progeney are expected to be Tall / hairless?

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Homework Answers

Answer #1

Answer: 5%
Explanation:
Tall = T = Dominant allele
Short = t = recessive allele
Hairy = H = Dominant allele
Hairless = h = recessive allele

The distance between T and H = 10 cM
Parent 1 = TtHh
Parent 2 = tthh

Assuming that both genes are in cis-conformation,

Dihybrid test cross: TtHh X tthh
Progeny:
Parental combinations = 90%
TH/th + th/th = 90%
TH/th = th/th = 45%

Recombinants = 10%
Th/th + tH/th = 10%
Th/th = tH/th = 5%

Tall and hairless = Th/th = 5%

If both genes are in repulsion, the answer would be 45%

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