Question

Assuming a straightforward dominant/recessive relationship, what makes an allele “dominant” to the other one?

If you were trying to determine which of two alleles for a particular gene was dominant, what kind of individual could you look at to answer this? (For example, if you had three individuals, one homozygous for Allele 1, one heterozygous, and one homozygous for Allele 2, which would be most helpful?)

Answer 1

An allele is said to be dominant if it succeeds to express its genes in an individual. Arecessive allele is not able to express its genes in the individual.

Dominant allele can express themselves when found in homozygous or heterozygous condition whereas a recessive one is expressed in homozygous condition only.

Now, to determine which of two alleles is dominant, we can look at the heterozygous individual. This will show us the expressed characters because dominant genes are always expressed.