Question

An allele is dominant if it is expressed in
(a) both homozygous and heterozygous states
(b) second generation
(c) heterozygous combination
(d) homozygous combination

Answer 1

(c) Heterozygous combination


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Answer 2

Answer:

An allele is dominant only if it gets expressed in (c) heterozygous combination.

Explanation:

The homozygous combination is the condition in which both the alleles are similar, i.e. a gene has identical alleles on both the chromosomes( homologous chromosomes).

On the other hand, the heterozygous combination is the one in which a gene has dissimilar alleles on both the chromosomes and in such a situation the allele that gets expressed is the dominant one whereas the allele that gets suppressed is the recessive one.