The Genotypes and Phenotypes That Result from the Cross of Aa

question 18

Multiple Choice

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

• A) genotypes-25% AA,50% Aa,25% aa;phenotypes-75% normal,25% albino.
• B) genotypes-100% aa;phenotypes-50% normal,50% albino.
• C) genotypes-50% AA,50% aa;phenotypes-50% normal,50% albino.
• D) genotypes-25% AA,50% Aa,25% aa;phenotypes-25% normal,75% albino.
• E) genotypes-75% AA,25% aa;phenotypes-75% normal,25% albino.

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Definitions:

Pathogenic Bacteria

Microorganisms that can cause disease in their host.

Streptococcus

A genus of coccus-shaped bacteria, some species of which are responsible for strep throat, scarlet fever, and other infections.

E. coli

A common bacterium found in the intestines of humans and animals that can cause food poisoning when consumed in contaminated food.

Microbes

Tiny, single-celled organisms, including bacteria, viruses, fungi, and protozoa, that can exist in a variety of environments.