Limited sex trait. Ultimately based on the different gamete size and the resulting sex roles, most animal species have acquired traits that occur only in one of the sexes.

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But even in species with less sexual dimorphism many morphological or behavioural characters differ between males and females.

Journal of Evolutionary Biology Volume 12, Issue 5.

Matching I-A 1.

Together, this means that depending on the f i values either none of the two alleles, both of the alleles or only allele S will be able to invade a given population.

Despite having the same genotype, both the sexes show different traits or phenotypes for these genes.

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