Question

A gene is said to be dominant if

• A. it expresses its effect only in heterozygous condition
• B. it expresses its effect only in the homozygous state
• C. it never expresses its effect in any condition
• D. it expresses its effect both in homozygous and heterozygous conditions

Answer 1

The correct option is D

it expresses its effect both in homozygous and heterozygous conditions

The correct option is D

Explanation of correct option

1. Individuals carrying two identical alleles (RR or rr) are known as homozygous.
2. Organisms having different alleles (Rr) are known as heterozygous.
3. A dominant allele is expressed in both homozygous and heterozygous conditions whereas a recessive trait is expressed only in the homozygous condition.
4. Every offspring takes two versions of each gene, known as alleles, from each of the parents.
5. If the alleles of a gene are different, and one allele is expressed; it is the dominant gene.
6. The effect of the other allele, called recessive, is masked known as the recessive gene.

Final answer: A gene is said to be dominant if it expresses its effect both in homozygous and heterozygous conditions.