How do you find the genotypic ratio of a cross?


What genotype is used in a test cross?

In its simplest form, a test cross is an experimental cross of an individual organism of dominant phenotype but unknown genotype and an organism with a homozygous recessive genotype (and phenotype).

How does test Cross help to determine the genotype of an individual?

Detailed Answer :Test-cross helps to determine the unknown genotype by crossing it with the recessive parent. If in the progeny all are dominant type then the individual is homozygous and if in the Progeny dominant to recessive ratio is 1 : 1 the individual is heterozygous.

When you see a 9 3 3 1 ratio from a dihybrid cross it indicates that you are working with?

Explanation: If both parents are heterogeneous for both traits the ratio of phenotypes is the ratio of 9:3:3:1. One trait is dominant and the other trait is recessive.

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