The Genotypes and Phenotypes That Result from a Cross of AA

question 2

Multiple Choice

The genotypes and phenotypes that result from a cross of AA and Aa (A = normal pigmentation and a = albinism) are

• A)phenotypes:all normal; genotypes:50% homozygous dominant and 50% heterozygous.
• B)phenotypes:50% normal and 50% albino; genotypes:all heterozygous.
• C)phenotypes:75% normal and 25% albino; genotypes:75% heterozygous and 25% homozygous.
• D)phenotypes:all albino; genotypes:50% heterozygous and 50% homozygous recessive.

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Definitions:

Environmental Factors

Physical, chemical, and biological elements of the environment that can influence living organisms and ecosystem functions.

Low Sperm Count

A condition characterized by a lower number of sperm in the ejaculate than the normal threshold, which can lead to reduced fertility in males.

Erectile Dysfunction

A condition characterized by the inability to maintain an erection sufficient for satisfactory sexual performance.

Sterility

The condition of being unable to produce offspring or bear children, which can occur in both humans and other organisms.