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JAMB Biology 2011 Question 42

Question 42

Chromosomes, DNA and Sex Linkage

The inheritable characters that are determined by a gene located only on the X-chromosome is

  1. A.homozygous
  2. B.dominant
  3. C.recessive
  4. D.sex-linked.
Show the answer and explanation

Answer: D (sex-linked.)

Explanation

Characters controlled by genes on the sex chromosomes, such as colour blindness and haemophilia on the X chromosome, are sex-linked.