If a Is Dominant to a and B Is Dominant

question 53

Multiple Choice

If A is dominant to a and B is dominant to b, what is the expected phenotypic ratio of the cross AaBb × AaBb?

• A) 16:0:0:0
• B) 8:4:2:2
• C) 1:1:1:1
• D) 9:3:3:1

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Definitions:

Congenital Adrenal Hyperplasia

A group of inherited disorders of the adrenal gland whereby individuals born with this condition lack an enzyme needed by the adrenal gland to make the hormones cortisol and aldosterone.

5-alpha Reductase Deficiency

A genetic condition that affects male sexual development before birth and during puberty.

Turner Syndrome

A chromosomal disorder affecting females, characterized by the partial or complete absence of one X chromosome, leading to developmental issues and infertility.

Masculine Appearance

Physical traits or characteristics traditionally associated with men or male gender roles.