Question

Expression of different genes for different traits may show dominance, incomplete dominance, or co-dominance. Write about expression of such genes with examples for one of the above modes.
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Hint:

Gene expression patterns like dominance, incomplete dominance, and co-dominance reveal the diversity of inheritance in organisms.

Answer 1

Dominance: A dominant allele masks the expression of a recessive allele. For example, in pea plants, the allele for tallness (T) dominates over dwarfness (t). A heterozygous plant (Tt) will be tall. Incomplete dominance: The heterozygous phenotype is an intermediate. Example: In snapdragons, crossing a red flower (RR) with white (rr) produces pink flowers (Rr). Co-dominance: Both alleles are equally expressed. Example: In humans, IA and IB alleles are co-dominant, resulting in blood group AB. % Quick tip