Question

You have isolated two new mutant flies that you've named fuzzy bristles and curly winged. You have a hunch that both traits are recessive autosomal traits. What breeding experiments would you set up that would help you confirm your hunch?

Answer 1

To check the genotype of parent that that is recessive or dominant you will do test cross.

in the test cross we conduct bredding in between unknown genotypic parent and a conferm pure breeding recessive parent.

unknown and homozygous recessive parent.

In this test cross unknown parents produce gamets and then these gamets are fertilized with the known recessive gamets.

Both are fused and then allowed to produce offsprings. the known recessive parent cannot show its expression because it is in recessive condition. So the any other expression which is expressed by offsprings can be considered as the character of unknown parent.

That is how by the phenotypic characters of offsprings we can determine the genotype which are produced by unknown parent. By the gametic genotype we can obtain the genotype of unknown parent.