BIO120H1 Lecture Notes - Lecture 6: Mendelian Inheritance, Sexual Reproduction, Dioecy
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BIO120H1 Full Course Notes
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Self-fertilization: sexual reproduction with yourself, gametes are still produced. Parthenogenesis: clonal / asexual, some species can reproduce sexually and asexually. Darwin does not know why this form of reproduction was favoured. Many perennial plants reproduce through both sexual and clonal reproduction. Time and energy to nd and attract a mates. 50% less genetic transmission, sexual females contribute 50% of their genes to the zygote, however asexual contributes 100%. This is known as a transmission bias favouring asexuals. Break up of adaptive genes combinations (independent assortment, sexual selection may break up those adaptive assortments that allow survival). Sexual reproduction can continually re-create unfavourable combinations of alleles. Brings together favourable mutations, eliminating harmful mutations bene ts of genetic variation in variable environments lottery model. Temporally heterogeneous environments red queen hypothesis" environments that change a lot over time. Numerous theoretical models but a paucity of experimental evidence. Favourable combinations of mutations brought together more rapidly by sex.
