BIO120H1 Lecture Notes - Lecture 6: Outcrossing, Parthenogenesis, Asexuality
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BIO120H1 Full Course Notes
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Offspring are copies of the individual that produced the offspring. In water fleas (daphnia) different reproductive systems occur in different environments. Massive bottle neck founder effect, largely cloning. The amazon has very large water level fluctuation. It is a free floating plant, when the water is high it reproduces because of the high nutrient content. When the water is low the plants are stranded in lakes. Seeds need to tolerate dry conditions (float with water) Costs of sex time and energy to find and attract mates (not a problem in cloning because all it is growing and breaking off into pieces) increased energetic costs risk of predation & infection (stds) cost of producing males. 50% less genetic transmission (you only pass half of your genes to the next generation, sharing genes) Break up of adaptive genes combinations (mate with somebody else, breaks up your genes, perhaps decreasing fitness) This is the big question known as the paradox of sex".
