Question

In a test cross involving $F_1$ dihybrid flies, more parental type offspring were produced than recombinant type offspring, this indicates

• A. Both the characters are controlled by more than one gene
• B. The two genes are located on two different chromosomes
• C. Chromosomes failed to separate during meiosis
• D. The two genes are linked and present on the same chromosome.

Answer 1

The correct option is D

The two genes are linked and present on the same chromosome.

Test cross is a mating between recessive alleles and homozygous allele to identify genotype of an individual. In a test cross, if more parental type offspring is produced then two genes are linked and present on same chromosome.