When Two Different Alleles Both Express Themselves in a Heterozygous

question 57

Multiple Choice

When two different alleles both express themselves in a heterozygous individual in a way that is different from the expression of either allele alone, these alleles are said to be:

• A) recessive.
• B) dominant.
• C) polygenic.
• D) codominant.

---

Definitions:

Midrange Forms

Species or variations within species that exhibit characteristics or traits intermediate between two distinct groups, reflecting evolutionary or genetic transitions.

Trait

A distinct characteristic or attribute of an organism that can be passed from one generation to the next through genetic inheritance.

Selection Phenomenon

The process by which certain traits become more or less common in a population due to differential reproduction of their bearers.

Sickle-Cell Anemia

An inherited blood disorder characterized by the production of abnormal hemoglobin, leading to deformed red blood cells that can cause blockages and severe pain.