In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klinefelter's syndrome in males. It proves:
Correct answer: A. In humans, the Y chromosome is crucial for male sex determination
- A. In humans, the Y chromosome is crucial for male sex determination
- B. The Y chromosome is integral to sex determination in both humans and Drosophila
- C. In Drosophila, the Y chromosome determines femaleness
- D. The Y chromosome contains genes for Klinefelter's syndrome in humans
Explanation
The question explores the different roles of the Y chromosome in sex determination across species. In humans, the presence of a Y chromosome leads to male development, which is why the XXY condition results in Klinefelter's syndrome in males. In contrast, for Drosophila, sex determination is primarily based on the number of X chromosomes, with two X chromosomes resulting in femaleness, regardless of the presence of a Y chromosome. Therefore, the correct answer is that in humans, the Y chromosome is crucial for male sex determination. Options B, C, and D are incorrect because they either misstate the role of the Y chromosome in Drosophila or misunderstand the genetic basis of Klinefelter's syndrome.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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