A Female Fruit Fly with Singed Bristles Was Mated with a Male

question 29

Multiple Choice

A female fruit fly with singed bristles was mated with a male from a true-breeding wild-type stock with long bristles.All of the F₁ females had wild-type bristles and all of the F₁ males had singed bristles.If the F₁ flies are intercrossed,the expected ratio of long to singed bristles in the F₂ flies is

• A) 1:0 in both sexes (i.e. ,males and females will all have long bristles).
• B) 3:1 in both sexes.
• C) 3:1 in females,while all the males will have singed bristles.
• D) 1:1 in females,while all the males will have singed bristles.
• E) 1:1 in both sexes.

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Definitions:

Pruritus

The medical term for itching, a symptom that can result from various conditions and cause a desire to scratch.

Jaeger Chart

A chart used in eye examinations consisting of texts of various sizes to test near vision acuity.

Hyperopia

A vision condition also known as farsightedness, where distant objects are seen more clearly than close ones.

Myopia

A common vision condition characterized by difficulty in seeing distant objects clearly, often referred to as nearsightedness.