Sex-linked traits and reading pedigrees — practice questions
3 questions in the bank on this idea. Below are 3 of them, exactly as they appear in a test.
A classic X-linked recessive human disorder:
- A. Down syndrome
- B. Turner syndrome
- C. haemophilia
- D. Klinefelter syndrome
Why are X-linked recessive traits expressed more often in human males than in females?
- A. Males inherit two X chromosomes
- B. Males have only one X chromosome
- C. The Y chromosome carries a matching dominant allele
- D. Females never inherit recessive alleles
A pedigree shows an affected father and an unaffected mother. All daughters are carriers, while no sons are affected. Which inheritance pattern best fits?
- A. Mitochondrial inheritance
- B. Autosomal dominant inheritance
- C. Y-linked inheritance
- D. X-linked recessive inheritance
Want to know which of these you would get wrong?
Reading a question and answering it under a clock are different things. Take the 20-question diagnostic and see where the marks actually go.
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