Question

When the alleles in a pair interact and the resulting phenotype reveals the influence of one allele more than that of the other allele, this pattern is called: an additive gene pattern. a dominant-recessive pattern. an on-off switching pattern. a differentiation pattern?

Answer 1

The correct answer is “a dominant-recessive pattern".

A dominant-recessive pattern pertains to the characteristics of the allele to portray a certain phenotype. A dominant allele (represented by capital letters) will show the phenotype even if the other allele is recessive (represented by small letters). A recessive allele will only manifest a phenotype of both alleles are recessive.

For example:

A is the dominant trait that will make the peas green; a is the recessive allele that will make the peas yellow

The pair AA are both dominant alleles and will make the peas green. The pair Aa has both the dominant allele and the recessive allele but since the dominant allele is present, the peas will still be green. The pair aa has both the recessive allele and will make the peas yellow.