What is a two- point test cross, involving a dihybrid F1 fly, used for when mapping genes?
A) to determine if the F1 fly is homozygous dominant or heterozygous
B) to determine the allele combinations that a homozygous recessive fly can create
C) to determine which alleles are dominant and which are recessive
D) to determine the recombination frequency between two genes
E) to determine the allele combinations that the F1 fly can produce

Question

Quizplus · Accepted Answer

A two-point test cross involving a dihybrid F1 fly is used to determine the recombination frequency between two genes, which helps in mapping the genes on a chromosome by showing how often they are inherited together.

What Is a Two- Point Test Cross, Involving a Dihybrid