A Recessive Allele

question 36

Multiple Choice

A recessive allele:

• A) expresses itself in heterozygous individuals.
• B) is never expressed in heterozygous individuals.
• C) is the result of the interaction among several recessive alleles.
• D) has a phenotypic expression that is not affected by the environment.

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Definitions:

Hemostasis

Hemostasis is the physiological process by which bleeding ceases, involving blood vessel constriction, platelet plug formation, and blood clotting.

Prothrombin

A plasma protein that is converted into thrombin during the blood clotting process, playing a critical role in hemostasis.

Thrombin

An enzyme in blood plasma that causes the clotting of blood by converting fibrinogen to fibrin.

Hematocrit

Hematocrit is a blood test measure that indicates the proportion of red blood cells to the total blood volume, expressed as a percentage.