Question

Three-point test crosses that track 3 genes

A.Detect double crossing over events

B.Require heterozygous gametes

C. Determine gene order on a chromosome

D. Both A and B

E. Both B and C

F. Both A and C

Answer 1

Both B and C

Three point testcross refers to analyzing the inheritance pattern of3 alleles by testcrossing a triple heterozygote with a triple recessive homozygote. It enables us to determine the distance between the three alleles and the order in which they are located on the chromosome.

Thus the gametes obtained would be heterozygous.