A person with the sex chromosomes XXY suffers from:
Correct answer: B. Klinefelter's syndrome
- A. Gynandromorphism
- B. Klinefelter's syndrome
- C. Down's syndrome
- D. Turner's syndrome
Explanation
Klinefelter's syndrome, also known as XXY syndrome, is a condition where males have an extra X chromosome, leading to the karyotype 47, XXY. This can result in a range of symptoms including reduced muscle mass, facial hair, and testosterone levels, as well as potential learning difficulties. Gynandromorphism is not applicable here as it is not a human genetic condition but rather a phenomenon observed in some animals. Down's syndrome involves an extra chromosome 21, unrelated to sex chromosomes. Turner's syndrome is characterized by the presence of a single X chromosome in females, not an additional X chromosome in males, as with 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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