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Reproduction In Organisms

Question
CBSEENBI12003424
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Assertion: Hbs Hbs denotes the homozygous condition for sickle-cell anaemia.

Reason: It occurs due to substitution of glutamic acid by valine at the 6 position of (B-chain of Hb.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.

Solution

B.

If both assertion and reason are true but reason is not the correct explanation of assertion.

Sickle cell anaemia is an autosomal hereditary disorder in which the erythrocytes become sickle shaped. The disorder or disease is caused by the formation of an abnormal haemoglobin called haemoglobin-s denoted as Hbs. Thus, the genotype of an individual homozygous for sickle cell anaemia is written as Hbs Hbs.

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