Biology for IGCSE & O level - Inheritance (Section 1 - No. 10)
Which of the following is a characteristic of a recessive allele?
It is always expressed.
It is only expressed when homozygous.
It masks the effect of other alleles.
It is always more common in the population.
Giải thích
A recessive allele's effect is masked by a dominant allele if present.