Definition and Significance of Test Cross

Q.

The technique used to find out if a dominant phenotype is homozygous or heterozygous is called:

1. back cross

2. test cross

3. Punnett tool

4. monohybrid 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.

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

1. Batch cross

2. Top cross

3. Inter cross

4. Test cross

Q. In order to find out the different types of gametes produced by pea plants having the genotype AaBb, it should be crossed to a plant with the genotype :

1. aabb
2. AABB
3. aaBB
4. AaBb

Q. The genotype of a plant showing the dominant phenotype can be determined by :

1. Back cross
2. Test cross
3. Dihybrid cross
4. Pedigree analysis

Q. What is the ratio of progeny, when a red-flowered heterozygous plant is crossed with a white-flowered plant, in which red flower is dominant to white flower?

1. 3 : 1
2. 1 : 1
3. 1 : 2 : 1
4. 9 : 3 : 3 : 1

Q. Test cross involves :

1. Crossing the $F_1$ hybrid with a double recessive genotype
2. Crossing between two genotypes with dominant trait
3. Crossing between two $F_1$ hybrids
4. Crossing between two genotypes with recessive trait

Q. A common test to find the genotype of a hybrid is by :

1. Crossing of one $F_2$ progeny with female parent
2. Studying the sexual behaviour of $F_1$ progenies
3. Crossing of one $F_2$ progeny with male parent
4. Crossing of one $F_1$ progeny with male parent

Q.

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

1. Monohybrid cross

2. Dihybrid cross

3. Back cross

4. Test 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