Suppose That Pigmentation of a Labrador Retriever's Fur Is Subject

question 27

Multiple Choice

Suppose that pigmentation of a Labrador retriever's fur is subject to epistasis of the B alleles by the e alleles. B (black) is dominant over b (chocolate brown) . E is dominant over E.Homozygous e is epistatic to the black and chocolate-brown genes. Given this information, what will result from a F₁ dihybrid cross between two dogs?

• A) 9/16 black, 6/16 brown, 1/16 yellow
• B) 9/16 black, 3/16 brown, 4/16 yellow
• C) 9/16 yellow, 6/16 brown, 1/16 black
• D) 9/16 yellow, 3/16 brown, 4/16 black

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Definitions:

Holter Monitor

A device that attaches electrodes to a patient’s chest for the purpose of obtaining a 24-hour ECG tracing in an accessory tape recorder.

ECG Electrodes

Small, adhesive patches used during an electrocardiogram (ECG) to detect electrical activity of the heart and record it.

Chest Wall

The structure comprising the ribs, sternum, and spine that encloses and protects the thoracic cavity and its contents.

Routine Annual Physical Examination

A yearly health checkup that includes a general physical exam and various tests to assess an individual's health.