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28 July, 16:27

Consider the sex-linked inheritance patterns of a cross between two flies, a white-eyed female (XWX) and a red-

eyed male (xWY). In this case, the inheritance of a sex-linked trait, only the female flies would have red eyes. If this

gene were on a non-sex chromosome, or autosome, what would be the expected outcome for offspring eye color?

There is a 50:50 chance that fly offspring will have red eyes or

white eyes.

Red eyes are not gender specific and 100% of the offspring

would have red eyes.

100% of the male offspring would have red eyes and 50% of the

female offspring would have red eyes.

D)

Red eyes are not gender specific. Depending on the genotype of

the male fly, WW or Ww, either 100% or 50% of the offspring

would have red eyes.

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Answers (2)
  1. 28 July, 17:13
    0
    Red eyes are not gender specific and 100% of the offspring

    would have red eyes would have red eyes if the gene were on autosome.

    Explanation:

    If the eye colour is not sex-linked and the traits are on the autosomes.

    Genotype for male = XWY or XwY

    Genotype for female = XWXW, XWXw. XwXw

    Punnet square:

    cross between red eye male and white eye male

    XW Y

    XW XWXW XWY

    XW XWXW XWY all oofspring red eye

    cross between white eye male and red eye female

    Xw Y

    XW XWXw XWY

    Xw XwXw XwY 1 red male:1 white male: 1 red male : 1 white female

    if mother has recessive gene all the male will be white eyed.

    all the female progeny will have red eye because father had dominant red eye.

    The red eye is dominant over white hence dominant trait will appear.
  2. 28 July, 17:38
    0
    Answer: The correct answer is D. Red eyes are not gender specific. Depending on the genotype of the male fly, WW or Ww, either 100% or 50% of the offspring would have red eyes.
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