A Strain of a Cereal Grain Can Be Either Dark

question 37

Short Answer

A strain of a cereal grain can be either dark tan, medium-dark tan, medium tan, light tan, or
cream colored. When a dark tan and a cream plant are crossed, all F₁ are medium tan. The F₂ are distributed in a ratio of 1:4:6:4:1 from darkest to lightest. How many additive alleles are needed
to produce the darkest phenotypes?

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Definitions:

Tardive Dyskinesia

A neurological syndrome characterized by repetitive, involuntary, purposeless movements, often caused by long-term use of certain psychiatric drugs.

Involuntary Muscle Movements

Muscle movements that occur without conscious control, such as reflexes or the beating of the heart.

Obsessions

Persistent, unwanted thoughts, images, or urges that cause distress and anxiety.

Panic Attacks

Sudden episodes of intense fear or acute discomfort, accompanied by physical and mental symptoms that may include palpitations, sweating, and feelings of doom.