In corn, the allele A allows the deposition of anthocyanin (blue) pigment in the kernels (seeds), while aa plants have yellow kernels. At a second gene, W - produces smooth kernels, while ww kernels are wrinkled. A plant with blue smooth kernels was crossed to a plant with yellow wrinkled kernels. The progeny consisted of 1447 blue smooth, 169 blue wrinkled, 186 yellow smooth, and 1510 yellow wrinkled.

a. Are the a and w loci linked? If so, how far apart are they?

b. What was the genotype of the blue smooth parent? Include the chromosome arrangement of alleles

c. If a plant grown from a blue wrinkled progeny seed is crossed to a plant grown from a yellow smooth F, seed, what kinds of kernels would be expected, and in what proportions?

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Biology

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21 October, 04:15

In corn, the allele A allows the deposition of anthocyanin (blue) pigment in the kernels (seeds), while aa plants have yellow kernels. At a second gene, W - produces smooth kernels, while ww kernels are wrinkled. A plant with blue smooth kernels was crossed to a plant with yellow wrinkled kernels. The progeny consisted of 1447 blue smooth, 169 blue wrinkled, 186 yellow smooth, and 1510 yellow wrinkled.

a. Are the a and w loci linked? If so, how far apart are they?

b. What was the genotype of the blue smooth parent? Include the chromosome arrangement of alleles

c. If a plant grown from a blue wrinkled progeny seed is crossed to a plant grown from a yellow smooth F, seed, what kinds of kernels would be expected, and in what proportions?

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Answers (1)

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Gustavo · Answer 1

A) Yes, 12 muB) AaWwC) 0.25%

Explanation:

As given,

Allele A for blue anthocynin.

aa for yellow kernel;

at second locus;

W produce smooth kernel,

ww for wrinkled kernel;

Parents as given are: AaWw and aaww

Progeny are:

blue smooth (AaWw) = 1447;

blue wrinkle (Aaww) = 169;

yellow smooth (aaWw) = 186;

yellow wirnked (aaww) = 1510

a)

Recombinant progeny are 169 + 186 = 355

non - recombinant progeny are = 1447 + 1510 = 2957

so recombination frequency (RF) = 346/2957*100 = 12.0054%

So a and w are linked genes.

They are 12 mu far away from each other.

b) Blue smooth parent = AaWw.

c) Aaww crossed with aaWw

progeny are = AaWw, Aaww, aaWw, aaww,

They all are produced in same proportion = 0.25% or 1/4.