Question

Two homozygous plants for flower colour and seed shape were crossed.
a. What will be the F1 generation.
b. Give F1 generation in selfing. What will be the phenotype and genetype ratio?
c. If F1 generation is crossed with recessive parent, what will is the cross called? Find the phenotype ratio​

Answer 1

a) The F1 generation will have CcRr genotype.

b) Phenotype of F1 generation = 9:3:3:1

Gentotype of F1 Generation: 1:2:1:2:4:2:1:2:1

c) phenotype of a test cross are 1:1:1:1.

Explanation:

Lets us name the genes responsible for flower colour as C, and that responsible for seed shape as R.

Dominant in each case is represented with a capital letter C for yellow and R for round.

Recessive in each case is represented with a small letter c for green and r for wrinkled.

Genotype for homozygous parents = CCRR, ccrr.

a) The F1 generation will have CcRr genotype.

b) Selfing of F1 generation.

Phenotype of F1 generation = round-yellow: wrinkled-yellow: round-green: wrinkled-green

Phenotype of F1 generation = 9:3:3:1

Gentotype of F1 Generation: 1:2:1:2:4:2:1:2:1

c) F1 generation X recessive parent.

CcRr X ccrr

This cross is known as test cross.

The genotype and the phenotype of a test cross are 1:1:1:1.