Question

Which of the following is true regarding the expression of a chromosomal genetic mutation that is expressed on a recessive allele?

The mutation will be expressed only in individuals that are heterozygous for the gene.

The mutation will be expressed approximately 50 percent of the time.

The mutation will be expressed consistently when the mutation occurs on a recessive allele.

The mutation will be expressed only if the individual has two copies of the recessive allele.

Answer 1

Note: Heterozygous means that both parents have 2 different alleles for a single trait.
Since a recessive trait is overpowered by the dominate allele, you would need both parents to have the recessive gene, so that a combination: (rr for example) could be a possibility.

Answer 2

The mutation will be expressed only if the individual has two copies of the recessive allele.
as in the individual having two copies of recessive allele means that the individual don't have dominating allele so mutation will be expressed in it

Answer 3

Thank You! :)