7 points To determine the linkage relationship of three gene

(7 points To determine the linkage relationship of three genes (A, B and C) in Dro three melanogaster you perform a three-point testcross with a fly that is heterozygous for all genes. The Fi progeny genotypes are: Number of F a/a B Alar b b c c a a b b C c 375 315 A/a B/b C/c 1,000 Total A) What is the recombination frequency between loci A and B? B) What is the recombination frequency between loci B and c? What is the recombination frequency between loci A and C? Page 16 MCELLBI X143 Form A.

Solution

Ans.A. Recombination frequency between loci A and B = 40.4%

AnsB. Recombination frequency between B and C = 37.5%

AnsC. Recombination frequency between A and C = 31.9%

AnsD. Yes, these genes are linked, because recombination frequency is less than 50%.