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Slow Increase of Allele C and Its Interaction with Allele A and S

Explore why allele C increases slowly when allele A is present and even more slowly in the presence of allele S. The genotypes and fitness factors are considered in relation to the evolutionary dynamics. The intensity of selection pressure varies based on the fitness differentials between genotypes and the presence of specific alleles.

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Slow Increase of Allele C and Its Interaction with Allele A and S

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  1. Why does C increase so slowly even when A is the only other allele? • AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA • When C is a new allele • Genotypes: • AA • AC • CC has the highest fitness, but it will increase in frequency slowly as few couples both carry the C allele to have CC babies

  2. Why does C increase even more slowly if S is present? • AAAAAAAASAAASAAAAAAAAAAAAAAAAAAAAAAAASAAAAAASAAAASAAAAAAACAAAAAAAAAAAAASAAAAASAAAASAAAAASAAASAAASAAAAA • When C is a new allele • When S = 0.12 • Genotypes: • AA (0.90) • AS (0.985), AC (0.954) • CC has the highest fitness, but it will increase in VERY frequency slowly as few couples both carry the C allele to have CC babies • AND because the fitness differential is smaller (selection is weaker since AS and AC have nearly equal fitness)

  3. Selection pressure: Intense vs. weakDepends on fitness differentials

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