Question

which statement describes incompletely dominant alleles?
○ two alleles that blend to create an intermediate phenotype
○ two alleles that are expressed separately and equally
○ any allele that can hide the presence of a different allele
○ any allele whose presence can be masked by another allele

Explanation:

Incomplete dominance is a genetic phenomenon where neither allele is completely dominant over the other. Instead, the two alleles "blend" together in the heterozygous individual to produce a phenotype that is intermediate between the two homozygous phenotypes. For example, in snapdragons, a red - flowered plant (RR) and a white - flowered plant (rr) can produce pink - flowered (Rr) offspring due to incomplete dominance.

• The option "two alleles that are expressed separately and equally" describes codominance (e.g., AB blood type where both A and B alleles are expressed).
• The option "any allele that can hide the presence of a different allele" describes a dominant allele in simple Mendelian dominance.
• The option "any allele whose presence can be masked by another allele" describes a recessive allele in simple Mendelian dominance.

Answer:

two alleles that blend to create an intermediate phenotype