BIO120H1 Lecture Notes - Lecture 7: Inbreeding, Sperm Competition, Parental Investment
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BIO120H1 Full Course Notes
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The evolution of sexual selection specifically proves to be probably less efficient than asexual reproduction. In aphids, sexual reproduction begins when females morph into males later into the season. Possibly, this is due to a crowded, uncertain and difficult environment. In water hyacinths, flowering and sexual reproduction occurs around the edges, resulting from difficult environments/less water. Since asexual reproduction produces many more offsprings, sexual reproduction is a mutation from the ancestral asexual reproduction. The reproductive rate of sexual reproduction requiring two individuals, means slower reproduction but at the same time greater variance in offspring. Sexual reproduction meant fitness has become a lot higher, overcoming the numbers game. Sexual reproduction meant that overtime different genes, say abc, spreads much slower in asexual reproduction, but in sexual environments abc spreads rather quickly. Asexual reproduction is usually average on the fitness scale, while sexual reproduction has a wider distribution, and hence more possible individuals with greater fitness.
