You are evaluating genetic linkage between two autosomal genes in a dwarf breed of Nigerian goats....

You are evaluating genetic linkage between two autosomal genes in a dwarf breed of Nigerian goats. At these genes, black fur (T) is dominant to tan fur (t) and pointed ears (R) is dominant to rounded ears (r). You mate true breeding parents and the F₁ are TtRr. You conduct a testcross and generate the following phenotypes in the F₂.

Progeny Number

black fur, rounded ears 425

tan fur, pointed ears 557

black fur, pointed ears 146

tan fur, rounded ears 151

Which alleles are linked on the homologous chromosomes of the true breeding parents?

b. What is the recombination frequency between the two genes?

Expert Solution

Answer-

a) T and r alleles are linked on the chromosome of one true breeding parent.

t and R alleles are linked on the chromosome of other true breeding parent.

Genotype of F1 is Tr/tR. So, genotype of one true breeding parent will be Tr/Tr and other true breeding parent will be tR/tR.

b) Recombination frequency between two genes is 23.2%

The explanation is given below:

gladiator answered 2 years ago

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