Suppose That You Examine a Vial of 100 Flies That

question 47

Multiple Choice

Suppose that you examine a vial of 100 flies that are all offspring from a single genetic cross. Also suppose that the only females you see present are red-eyed, but the males you see present are both red-eyed and white-eyed. The allele for red eye colour (X^w+) is dominant over the allele for white eye colour (X^w) . Which of the following describes the genotypes of the parents?

• A) X^w+X^w; X^w+Y
• B) X^wX^w; X^w+Y
• C) X^w+X^w; X^wY
• D) X^w+X^w+; X^w+Y

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Definitions:

In Vivo

A term used to describe processes or experiments performed in living organisms.

Exposure

A therapeutic technique aimed at reducing anxiety and fear by gradually and systematically exposing the patient to the feared object, situation, or activity.

Imaginal Exposure

A therapeutic technique used in treating anxiety disorders by repeatedly exposing the patient to imagined scenes of traumatic events.

In Vitro

Experiments or processes performed outside of a living organism, typically in a controlled environment like a laboratory.