2. In corn, the G gene encodes an enzyme that synthesizes anthocyanin and produc

Question

2. In corn, the G gene encodes an enzyme that synthesizes anthocyanin and produces purple leaves.g/g plants have green leaves. A second gene R is required for smooth leaves and r/r plants have wrinkled leaves. A heterozygous plant with purple-smooth leaves was crossed to a plant with green-wrinkled leaves. The F1 generation produced 1447 plants with purple-smooth leaves, 151 purple-wrinkled, 137 green-smooth, and 1510 green-wrinkled. A) Based on the distribution of progeny phenotypes, the G and R genes appear to be linked. In one or two sentences, explain why. B) What is the percent of recombinant offspring in the F1 generation? C) How far apart are the G and R genes?

Explanation / Answer

A) As the offspring from the F1 plant is not in the ratio of 1:1:1:1, which indicates that the genes are linked.

B) The % of recombination = No. of recombinants / Total number of progeny X 100.

= 137+151/ 1447+151+137+1510 X 100 = 8.87%.

C) The % of recombination = distance between the genes, so the distance between the G and R genes is 8.87 MapUnits.

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