Asked in NUMS 2023 202385% of students get this right

Which of the following traits is transmitted directly from an affected father to only his son?

Correct answer: C. Y-linked

  • A. Autosomal
  • B. X-linked
  • C. Y-linked
  • D. X-Y linked

Explanation

Y-linked traits are passed from father to son through the Y chromosome. They are not present on the X chromosome and are specific to male inheritance

This question appeared on the NUMS 2023 paper, which you can sit online with every answer explained.

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About X-linked Recessive Inheritance

X-linked recessive inheritance involves genes on the X chromosome, so males express a recessive allele with no corresponding allele on their single X chromosome, while females may be carriers. Pedigrees cover haemophilia and red-green colour blindness, including carrier mothers, affected sons and the absence of father-to-son transmission.

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