Waxy endosperm (a) shrunken endosperm (b) & yellow seeds (c) are three recessive

Question

Waxy endosperm (a) shrunken endosperm (b) & yellow seeds (c) are three recessive genes that are linked in corn plants on chromosome 5. Two corn plants (true breeding for these genes) are crossed. The F1 progeny are all wild type. One of these F1 progeny is crossed to a test plant, & the following progeny are produced:

Wild type 1499

b c 97

a b c 1537

c 3485

b 291

a c 274

a b 3492

a 85

(A)What is the genotype of each parent? (B) What is the order of these genes on Chromosome 5? (C) Determine the distances between these loci? (D)Determine the COC & Interference among these genes? (E) What does this I value suggest?

Explanation / Answer

To calculate recombinants RF = 97 + 291+ 274+ 85=747

total traits= 9261

When calculated recombination frequency = 747/9261 x100 = 8 m.u

so we can conclude that recombinants are linked on same chromosome.

For the remaining traits RF =8514/9261x100 =91

This shows that the remaining progeny are not linked and also not on same chromosome.

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