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KCET2026BiologyPrinciples of Inheritance and Variation

In a practical examination, the below given pedigree chart was given as spotter for identification. The students identified the pedigree chart as ____

Options

  1. AAutosomal recessive
  2. BAutosomal dominant
  3. CSex-linked dominant
  4. DSex-linked recessive

Correct answer

B. Autosomal dominant

Step-by-step solution

If the trait were sex-linked recessive, the affected mother in generation I would have only affected sons. Since she has an unaffected son in generation II, it is not sex-linked recessive. The trait appears in all generations, indicating a dominant trait. Assuming it is autosomal dominant, let the affected allele be A and the normal allele be a . The affected female in generation I must be heterozygous ( Aa ) because she has unaffected offspring ( aa ). Her unaffected partner is aa . The cross Aa aa produces both a

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