iii. A pure breeding tall plant producing oval fruit is crossed to a pure breedi

Question

iii. A pure breeding tall plant producing oval fruit is crossed to a pure breeding short plant producing round fruit.

1) What will be the genotype of the F1 offspring produced from this cross? In what linkage phase (coupling or repulsion) will the alleles be?

2)If one of the F1 offspring is testcrossed, what proportion of the resulting F2 offspring will be short and produce round fruit? If one of the F1 offspring is testcrossed, what proportion of the resulting F2 offspring will be tall and produce round fruit?

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In a diploid species of plant, the genes for height and fruit shape are linked and located 18 map units apart. Allele D produces tall plants and is dominant to the d allele which produces short plants. Allele R produces round fruit, which is dominant to allele r for oval fruit.

Explanation / Answer

Giventhe tall plant be represented by "T" and oval be represented by "r".

Given, the short plant be represented by "t" and round be represented by "R"

1.. cross is :- TTrr X ttRR

Result:- TTrr(tall oval) and ttRR(short round); since 18%recombinants are there 82% parental genotypes will be there18% tall round and short oval may also be produced.

2.. Testcross will be TtRr X ttrr

41% short round ; Similarly, 9% tall round.

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