passwella.
Menu

JAMB Biology 1994 Question 42

Question 42

Mendelian Inheritance

People with sickle-cell anaemia have haemoglobin

  1. A.S and are homozygous recessive
  2. B.A and are heterozygous recessive
  3. C.S and are heterozygous recessive
  4. D.A and are homozygous recessive.
Show the answer and explanation

Answer: A (S and are homozygous recessive)

Explanation

Sickle-cell sufferers have two copies of the recessive allele for haemoglobin S (genotype SS), so they are homozygous recessive.