BIO120H1 Lecture Notes - Lecture 6: Eichhornia Crassipes, Parthenogenesis, Outcrossing
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BIO120H1 Full Course Notes
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Inbreeding vs outbreeding: reproductive system asexual, sexual, sexual. Sexual system dioecious, hermaphrodite: hermaphrodite. Mating system cross fertilization, self fertilization. Water hyacinth: world"s worst invasive water plant, amazon, reproduces clonally and sexually, flowering along the edges. When water is high it clones because water is full of nutrients. When water is low cue that clones start flowering. Costs of sex: time and energy to find and attract mates, increased energetic costs, risk of predation and infection, cost of producing males, 50% less genetic transmission (clonal vs sexually produced, break up of adaptive genes combinations. Hypotheses for the advantages of sex: bringing together favourable mutations long term benefit, benefits of genetic variation in variable environments short term benefit lottery model . Lottery buy tickets for a lottery environment like a lottery, not a lot of winners becomes more intense more likely to be a winner if ou get. 1000 different tickets rather than copying 1000 copies of the same ticket.
