CLOSE REVIEWDiscuss how Mendel's principles can be used to predict the outcome of a genetic cross in fruit flies, specifically for eye color, which is a sex-linked trait.
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Mendel's principles can be applied to predict the outcome of a genetic cross in fruit flies for eye color, a sex-linked trait. Eye color in fruit flies is determined by a gene on the X chromosome. According to Mendel's Law of Segregation, males (XY) inherit their X chromosome from their mother and Y chromosome from their father, while females (XX) inherit one X chromosome from each parent. If a red-eyed female (X^R X^r) is crossed with a white-eyed male (X^r Y), the offspring will have a 50% chance of being red-eyed females (X^R X^r) and 50% chance of being white-eyed males (X^r Y).
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In a cross between a red-eyed female fruit fly (X^R X^r) and a white-eyed male (X^r Y), what is the expected phenotypic ratio of the offspring?
- A.
1 red-eyed female : 1 white-eyed male
- B.
3 red-eyed : 1 white-eyed
- C.
1 red-eyed male : 1 white-eyed female
- D.
1 red-eyed female : 1 red-eyed male
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