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NEETZoologyPrinciples of Inheritance and Variation

Select the correct statement for the given figure.

Options

  1. AThis is an autosome linked recessive trait that can be transmitted from parents to the offspring when either o
  2. BThe disease is controlled by an allele HbS.
  3. COut of the three possible genotypes only homozygous individuals for HbS (HbSHbS) show the diseased phenotype.
  4. DHeterozygous (HbAHbS) individuals appear affected and they are carriers of the disease.

Correct answer

C. Out of the three possible genotypes only homozygous individuals for HbS (HbSHbS) show the diseased phenotype.

Step-by-step solution

Sickle-cell anaemia : This is an autosome linked recessive trait that can be transmitted from parents to the offspring when both the partners are carriers for the gene (or heterozygous). The disease is controlled by a single pair of allele, HbA and HbS. Out of the three possible genotypes only homozygous individuals for HbS (HbSHbS) show the diseased phenotype. Heterozygous (HbAHbS) individuals appear apparently unaffected but they are carriers of the disease as there is 50 percent probability of transmission of th

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