Question

29, In fruit flies, red eyes are dominant over white eyes. The gene for eye color (R) is found on the X chromosome (X^R). Females have 2 X chromosomes and males are XY. Fill in the following (case sensitive!):

Genotype of a white eyed female:

Possible female gametes; separate gametes with a comma (,):

Genotype of a red eyed male:

Possible male gametes; separate gametes with a comma (,):

In fruit flies, red eyes are dominant over white eyes. The gene for eye color (R) is found on the X chromosome (X^R).

Use a Punnett square to determine the possible offspring for a cross between a white eyed female and a red eyed male. Females have 2 X chromosomes and males are XY. What is the phenotypic ratio of eye color?

Box 1: % red eyes

Box 2: %white eyes

In fruit flies, red eyes are dominant over white eyes. The gene for eye color (R) is found on the X chromosome (X^R).

Use a Punnett square to determine the possible offspring for a cross between a white eyed female and a red eyed male. Females have 2 X chromosomes and males are XY.

What color eyes do male offspring have?

In fruit flies, red eyes are dominant over white eyes. The gene for eye color (R) is found on the X chromosome (X^R).

Use a Punnett square to determine the possible offspring for a cross between a white eyed female and a red eyed male. Females have 2 X chromosomes and males are XY.

What color eyes do female offspring have?

Answer 1

White eyed male = XwY

Red eyed female = XrXr

XrXr × XwY

Gametes	Xr
Xw	XrDw red eyed female
Y	XrY red eyed male

Both males and females have red eyes.

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