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The results of Thomas Hunt Morgan’s last cross are shown in the Punnett square below.
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Which of Thomas Hunt Morgan's hypotheses was valid based on these results?
White eyes are lethal in female Drosophila.
White eyes are lethal in male Drosophila.
Female Drosophila with white eyes are homozygous recessive.
White eyes are the dominant trait in female Drosophila
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Female Drosophila with white eyes are homozygous recessive.
Explanation: Morgan’s white-eye allele is X‑linked and recessive. A female must have two copies of the mutant X (XwXw) to show white eyes, whereas a male (XwY) needs only the single mutant X. The Punnett square results are consistent with females being homozygous recessive for the white‑eye trait.
Explanation: Morgan’s white-eye allele is X‑linked and recessive. A female must have two copies of the mutant X (XwXw) to show white eyes, whereas a male (XwY) needs only the single mutant X. The Punnett square results are consistent with females being homozygous recessive for the white‑eye trait.
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