Biology 1001A Lecture Notes - Lecture 16: Plant Reproductive Morphology, Meiosis, Sequential Hermaphroditism
Document Summary
Cnemidophorus uniparens: born female, stay female their whole lives, they reproduce asexually. Sex as recombination: recombination -> genetic diversity. Offspring distinct from either parent and (usually) each other. Sexually reproducing organisms may be dioecious or monoecious: dioecious: two house holds, a male and a female (either male or female, can"t be both, monoecious: hermaphrodite, individual has both male and female reproductive parts. Sequential monoecy (sex change: change sex some point in their life, common in coral reef fishes, bluestreak wrasse: female to male, clownfish: male to female. Distribution of sex: first life forms almost certainly reproduced asexually. Most things, except plants and animals, reproduce mostly asexually. But among animals: marked in green is asexual, all the red tips are the organism reproduce sexually, most animals reproduce sexually. Why reproduce sexually: good reasons not to Only females bare offsprings, so it"ll be more efficient in only reproducing females. Mutational explanation for sex: sexual recombination benefits the species by speeding up evolution.
