Mental retardation in man, associated with sex chromosomal abnormality is usually due to:
Correct answer: D. Increase in X complement
- A. Moderate increase in Y complement
- B. Large increase in Y complement
- C. Reduction in X complement
- D. Increase in X complement
Explanation
Mental retardation in men associated with sex chromosomal abnormalities is often the result of an increase in X complement, leading to conditions like Klinefelter syndrome (XXY). This additional X chromosome can contribute to intellectual and developmental challenges in affected individuals.
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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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