Definition and Significance of Test Cross

Q.

A pea with white flowers was crossed to another pea which is also flower plant. When selfed the F₂ generation produced purple and white in the ratio 9:7. The reason for the results is that :

1. It is typical monohybrid mendelian ratio

2. Purple flower colour is dominant over the white

3. It is a complementary factor

4. None of the above

Q. Mating an organism to a double recessive in order to determine whether it is homozygous or heterozygous for a character under consideration is called

1. reciprocal cross
2. test cross
3. back cross
4. dihybrid cross

Q.

Study the following Punnett square and identify the genotypes of male and female parents

1. male parent - AaBb and Female parent - aaBB

2. Male parent - aaBB and Female parent - AaBb

3. Male parent - AaBB and Female parent - AaBb

4. Male parent - AABB and Female parent - Aabb

Q.

A cross between an individual of unknown genotype and a double recessive tester is called:

1. Back cross

2. Test cross

3. Monohybrid cross

4. Dihybrid cross

Q. The cross between an individual with unknown genotype and recessive parent is called a .

1. intercross
2. top cross
3. test cross
4. batch cross