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A woman who is a carrier for sickle cell anemia is advised that if her baby has two recessive genes, the penetrance of the disease is 100%, but the expressivity is variable. Which of the following explanations will clarify this communication for the mother? All babies with 2 recessive sickle cell genes will:

  • A. Develop painful vaso-occlusive crises during their first year of life.
  • B. Exhibit at least some signs of the disease while in the neonatal nursery.
  • C. Show some symptoms of the disease but the severity of the symptoms will be individual.
  • D. Be diagnosed with sickle cell trait but will be healthy and disease-free throughout their lives.
Correct Answer: C

Rationale: Individuals with two recessive genes will have the disease, but symptom severity varies.