Question

The chemical instructions of a __________ allele in an allele pair will be followed while those of a __________ allele will be ignored.

a) Dominant; recessive
b) Recessive; dominant
c) Co-dominant; incomplete dominant
d) Recessive; co-dominant

Answer 1

The answer to the fill-in-the-blank question is a) Dominant; recessive. In cases of dominant and recessive alleles, the dominant allele's traits are expressed in both homozygous dominant (AA) and heterozygous (Aa) organisms, while the recessive allele's traits are only expressed in homozygous recessive (aa) individuals.

Step-by-step explanation:

The chemical instructions of a dominant allele in an allele pair will be followed while those of a recessive allele will be ignored. The correct answer is a) Dominant; recessive. For a gene expressed in a dominant and recessive pattern, homozygous dominant (AA) and heterozygous (Aa) organisms will look identical, meaning they will exhibit the phenotype of the dominant allele. In contrast, the recessive allele's phenotype will only be expressed when the genotype is homozygous recessive (aa), where both alleles for a trait are recessive.

It's important to note that alleles do not always behave in this clear-cut dominant and recessive pattern. In some cases, such as codominance and incomplete dominance, both alleles contribute to the phenotype in different ways. In codominance, the phenotype exhibits both alleles simultaneously, while in incomplete dominance, the phenotype is intermediate between the two homozygous conditions.