Question

Dominant alleles require ______________ allele(s) to be present in a two allele system, in order to manifest in the phenotype.

Answer 1

Dominant alleles require one dominant allele to be present in a two allele system in order to manifest in the phenotype.

Step-by-step explanation:

In a two allele system, dominant alleles require one dominant allele to be present in order to manifest in the phenotype.

For example, let's consider a gene with two alleles: A (dominant) and a (recessive). If an organism has two copies of the dominant allele (AA), the dominant trait will be expressed in the phenotype. However, if the organism has one copy of the dominant allele and one copy of the recessive allele (Aa), the dominant trait will still be expressed.

So, dominant alleles only need a single copy of themselves to manifest, while recessive alleles need two copies to be expressed in the phenotype.