BIO270H1 Lecture Notes - Gamete, Vascular Plant, Fish Fin
Document Summary
Delay further reproduction so parent can tolerate cost of nurturing. Rabbits: both r and k type, many offspring and rapid, but provide care. Semelparous: reproduces once, dies after: pacific salmon. Variations in reproduction (variation for evolution: gametogenesis: genome of different combination of chromosomes, meiosis: chromosomal recombination, fertilization: unique combination of ova and spermatozoa. Hormones are the same in both males and females. * they bind to nuclear hormone receptor (nhr) nhr dimerizes with dna-binding proteins active transcription factor formed. Taxa specific: produced by hypothalamic neurons, released into portal system to the anterior pituitary. Induces production of testosterone by interstitial cells of testes. *mammals: y chromosome is sex determining for males. *birds/butterflies: w chromosome is sex determining for females. *others: not genotype determined: haplo-diploidy: fertilized diploid: female unfertilized haploid: male. Pivotal temperature: equal number of males and females. Proliferation of granulose: secretes ecm, zona pellucida formed (separates from oocyte) - there are.
