A dihybrid for qualitative trait is crossed with homozygous recessive individual of its type, the phenotypic ratio is

Question

A dihybrid for qualitative trait is crossed with homozygous recessive individual of its type, the phenotypic ratio is (A) 1: 2: 1 (B) 3: 1 (C) 1: 1: 1: 1 (D) 9: 3: 3: 1.

Tardigrade Admin · Accepted Answer

It is an example of test cross. A double heterozygous on test cross yields a ratio of 1: 1: 1: 1 . Such a test cross is also called dihybrid test cross. It is shown below by crossing dihybrid RrYy with homozygous recessive rryy. <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/biology/dc541e6bc07f6561286c5d27e0ca78a2-.png" />

Q. A dihybrid for qualitative trait is crossed with homozygous recessive individual of its type, the phenotypic ratio is

1 : 2 : 1

3 : 1

1 : 1 : 1 : 1

9 : 3 : 3 : 1.

It is an example of test cross. A double heterozygous on test cross yields a ratio of $1 : 1 : 1 : 1.$ Such a test cross is also called dihybrid test cross. It is shown below by crossing dihybrid $R r Y y$ with homozygous recessive $rryy .$

Q. A dihybrid for qualitative trait is crossed with homozygous recessive individual of its type, the phenotypic ratio is

1 : 2 : 1

3 : 1

1 : 1 : 1 : 1

9 : 3 : 3 : 1.

It is an example of test cross. A double heterozygous on test cross yields a ratio of 1:1:1:1. Such a test cross is also called dihybrid test cross. It is shown below by crossing dihybrid RrYy with homozygous recessive rryy.

It is an example of test cross. A double heterozygous on test cross yields a ratio of $1 : 1 : 1 : 1.$ Such a test cross is also called dihybrid test cross. It is shown below by crossing dihybrid $R r Y y$ with homozygous recessive $rryy .$