Multiple choice

In sickle cell anemia, death occurs when lethal gene is present in

  1. homozygous dominant state

  2. homozygous recessive state

  3. codominant condition

  4. heterozygous state

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In sickle cell anemia, individuals with the homozygous recessive state (HbS/HbS) suffer severe, often fatal, medical complications due to the malformation of red blood cells. Heterozygotes (carriers) generally exhibit normal health with resistance to malaria.