A woman with 47 chromosomes due to three copies of chromosome 21 is characterized by:
Correct answer: D. Down's syndrome
- A. Superfemales
- B. Triploidy
- C. Turner's syndrome
- D. Down's syndrome
Explanation
The correct answer is Down's syndrome, which results from trisomy 21, where an individual has an additional copy of chromosome 21, resulting in 47 chromosomes. This condition is known for its specific characteristic features such as intellectual disabilities and distinct facial features. The other options describe different chromosomal anomalies: Superfemales (47,XXX) involve an extra X chromosome, Triploidy involves a complete extra set of chromosomes, and Turner's syndrome involves a missing X chromosome, none of which include an extra chromosome 21.
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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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