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Mendelian Genetics

AP Biology· difficulty 4/5

From cross 1, F1 red-eyed females (XwXr) are crossed with F1 white-eyed males (XwY).

What is the predicted ratio of red:white among F2 offspring (combining both sexes)?

  • A

    1 red : 3 white

  • B

    1 red : 1 white

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  • C

    3 red : 1 white

  • D

    All red

Explanation

XwXr x XwY produces 1/4 XwXw (white female), 1/4 XwXr (red female), 1/4 XwY (white male), 1/4 XrY (red male). Red:white = 2:2 = 1:1.

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