BIO120H1 Lecture Notes - Lecture 6: Eichhornia Crassipes, Asexual Reproduction, Sexual Reproduction
36
BIO120H1 Full Course Notes
Verified Note
36 documents
Document Summary
Darwin did not know why sexual reproduction was favoured by evolution. Time and energy to find and attract mates. 50% less genetic transmission (each person contributes half, natural selection would prefer more, such as 100% per person) Kids will not be a copy of parent. Break up of adaptive genes combinations (can mess up natural selection) Bringing together favourable mutations, eliminated harmful mutations. Favourable combinations of mutations brought together more rapidly by sex. Can bring together favourable mutations and eliminate of harmful mutations. Asexual mutations were more harmful (stop codons) and more deleterious mutations. Asexual reproduction favours homogenous environments, sexual more favourable in variable conditions. Asexuality is sporadically distributed (more common in invertebrates) More common in plants (only a few that are exclusively asexual) Aseuxal species are usually at the tips of phylogenies. Long term evolutionary potential is low due to lack of genetic variation. Probably due to very low mutation rate.
