Question

Allele that does not affect phenotype in heterozygote (e.g., y)

a) Dominant allele
b) Recessive allele
c) Codominant allele
d) Carrier allele

Answer 1

The allele that does not affect the phenotype in a heterozygote is called a recessive allele. Carriers have one recessive and one dominant allele, showcasing the dominant trait while potentially passing on the recessive trait.

Step-by-step explanation:

The allele that does not affect the phenotype in a heterozygote, such as allele 'y' in your example, is referred to as a recessive allele. In a heterozygous genotype, like Aa, the dominant allele (A) masks the expression of the recessive allele (a). Therefore, the phenotype reflects the dominant allele's traits. Individuals who have one recessive allele and one dominant allele (Aa) are known as carriers of the recessive trait because they can potentially pass the recessive allele to their offspring without showing the recessive phenotype themselves. Only when there are two copies of the recessive alleles (aa) will the recessive trait be expressed.