Assume That a Researcher Is Studying Coat Color in Voles

question 48

Multiple Choice

Assume that a researcher is studying coat color in voles.Three strains of white vole have been isolated: milky, blanc, and weiss.White is a recessive trait in each strain.Homozygous white voles are obtained for each strain.Consider the following crosses: milky * blanc = all white progeny
Milky * weiss = all brown (wild-type vole color)
Blanc * weiss = all brown (wild-type vole color)
The conclusion most consistent with these results is

• A)all three strains have mutations in the same gene.
• B)all three strains have mutations in different genes.
• C)milky and blanc have mutations on the same gene, weiss has a mutation in a different gene.
• D)milky and weiss have mutations on the same gene, blanc has a mutation in a different gene.
• E)weiss and blanc have mutations on the same gene, milky has a mutation in a different gene.

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Definitions:

Hormones

A substance secreted by an endocrine gland that regulates various body functions.

Pituitary Gland

A small endocrine gland in the brain controlling various physiological processes through the release of hormones.

Bloodstream

The flowing blood within the circulatory system of the body, carrying oxygen, nutrients, and waste products to and from the tissues.

Neurotransmitters

Chemical substances in the brain that transmit signals from one neuron to another, playing a key role in the function of the nervous system.