Male XX and female XY sometime occur due to:
Correct answer: B. Transfer of segments in X and Y chromosome
- A. Deletion
- B. Transfer of segments in X and Y chromosome
- C. Aneuploidy
- D. Hormonal imbalance
Explanation
Male XX and female XY individuals can occur due to a transfer of segments between the X and Y chromosomes, which is represented by option (b). This genetic phenomenon leads to a mixing of genetic material from the X and Y chromosomes, resulting in individuals with atypical sex chromosome configurations. This condition is rare and typically has implications for sexual development and reproductive health. Deletion, aneuploidy, and hormonal imbalances can all impact sexual development but are not direct causes of this specific chromosomal rearrangement.
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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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