If You Were to Breed a Black Male Guinea Pig

question 45

Multiple Choice

If you were to breed a black male guinea pig to a brown female guinea pig in an attempt to determine which one was homozygous dominant and which one was homozygous recessive,how could you be certain that the guinea pigs are truly homozygous?

• A) The guinea pigs would be homozygous for black (or brown) coat color if each strain could be bred for many generations and only black (or brown) colored offspring were produced.
• B) If the immediate parents of the black (or brown) guinea pigs were both of that color, it proves they are homozygous.
• C) If a cross between the black and brown guinea pig produced four all black offspring, the black guinea pig would have to be homozygous for black coat color.
• D) If a cross between the black and brown guinea pig produced four all black offspring, this would prove the black guinea pig was recessive.
• E) Only microscopic examination of the guinea pig's genes could absolutely confirm homozygosity.

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Definitions:

Mycorrhiza

A symbiotic association between a fungus and the roots of a vascular plant, enhancing nutrient absorption.

Plasma Membrane

The lipid bilayer that encloses the cytoplasm of a cell, regulating the passage of substances in and out of the cell.

Rhizopus Stolonifer

A species of bread mold that reproduces both sexually and asexually, known for causing rot in soft fruits and vegetables.

Cellulose

A complex carbohydrate or polysaccharide that forms the main structure of plant cell walls, offering rigidity and strength.