01:447:380 Lecture Notes - Lecture 2: Asymmetric Cell Division, Punnett Square, Null Hypothesis
24 Jul 2016
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Meiosis arrested twice in females stopped in prophase i, and metaphase ii and the proteins holding the chromosomes. ~true breeding = homozygous, progeny are exactly like parents. ~each trait had two alleles, one was dominant, one was recessive. ~sex-determination can happen by chromosome separation, or transferring the genes that determine sex. ~henking named it x because it was at first unknown, like you call unknown x. ~drosophila sex determined by x:a ratio, ratio of # of x to ploidy # of autosomes. If it has xo, then it would be male because only the number. Not having y makes you female, even if you have 1 or 3 x. ~short arm of y chromosome has sex-determining region y (sry) gene. Can translocate this gene to another chromosome and make a male. ~why is sexual reproduction advantageous gives genetic variety, which can allow natural selection, takes longer to have progeny (have to wait for sexual maturity of parent, then gestation)
