Concept of Dominance and Recessiveness

Q.

Linkage decreases the frequency of

1. Hybrid

2. Dominant allele

3. Recessive allele

4. both A and B

Q.

Why do we have two alleles?

Q.

Dominant character appears both in homozygous and heterozygous condition, whereas recessive character appears only in homozygous condition.

1. True

2. False

Q.

What happens if you have two different dominant alleles?

Q. A gene is said to be dominant if:

1. It expresses its effect only in homozygous stage
2. It is expressed only in heterozygous condition
3. It is expressed both in homozygous and in heterozygous condition
4. It is never expressed in any condition

Q. Blue eye colour is recessive to brown eye colour. A brown-eyed woman, whose father was blue-eyed marries a blue-eyed man. The children can be

1. All blue eyed
2. Both blue eyed and brown eyed in the ratio 3: 1
3. Both blue and brown eyed in the ratio 1: 1
4. All brown eyed

Q.

Dominant character appears both in homozygous and heterozygous condition, whereas recessive character appears only in homozygous condition.

1. True

2. False