Question

The recessive gene sh produces shrunken endosperm in corn kernels and its dominant allele sh+ produces...

The recessive gene sh produces shrunken endosperm in corn kernels and its dominant allele sh+ produces full, plump kernels. The recessive gene c produces colorful endosperm and its dominant allele c+ produces colored endosperm. Two homozygous plants are crossed, producing and F1 all phenotypically plump and colored. The F1 plants are testcrossed and the following offspring were produced: 149 shrunken, colored, 4035 shrunken, colorless, 152 plump, colorless and 4032 plump, colored.

a. What were the phenotypes and genotypes of the parents?
b. How are the genes linked in the F1?
c. Estimate the map distance between sh and c.
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Answer #1

Answer:

a).

Hint: parental combinations are always large numbered than recombinant progeny in linkage.

So...

sh c/sh c (shrunken, colorless) x (plump, colored) sh+ c+/sh+ c+ ------ parents

sh+ c+ / sh c (plump, colored)---- F1

b).

The two genes are linked in cis configuration.

c).

Recombination frequency = (recombinants progeny / total progeny)100

RF = (149+152/8368)100

= 3.6%

RF (%)= distance between genes (m.u)

Distance between sh and c= 3.6 m.u.

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