LIFE SCIENCE

Detailed explanation-1: -Dominant and recessive genes. The most common interaction between alleles is a dominant/recessive relationship. An allele of a gene is said to be dominant when it effectively overrules the other (recessive) allele. Eye colour and blood groups are both examples of dominant/recessive gene relationships.

Detailed explanation-2: -They are dominant and recessive allele. The dominant allele whenever is present it is expressed in the phenotype. However the recessive allele is only express if there is no dominant allele present.

Detailed explanation-3: -A recessive allele does not produce a trait at all when only one copy is present. This contrasts to a dominant trait, which requires that only one of the two alleles be present to express the trait.