Given pedigree shows that the trait is inherited as autosomal dominant. Trace the genotype of Mother and Father

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Sol.(d) [Key Concept: Autosomal Dominant — Pedigree Genotype Analysis] From the pedigree showing autosomal dominant inheritance: The trait is autosomal dominant (shown by filled symbols = affected). Father is UNAFFECTED (empty square) → Father must be aa (homozygous recessive, no dominant allele). Mother is AFFECTED → Mother carries at least one A allele. Since some children are unaffected (aa), the mother must be HETEROZYGOUS (Aa), contributing either A or a to offspring. An AA mother would produce all affected children. Therefore: Father = aa, Mother = Aa → option (d).

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