Fruitflies Female xx Male XY Is sex determined by presence/absence of Y? Is sex determined by number of xs?
Fruitflies 1916 Female Xx XXy o Male XY XO Sex is determined by number of xs
Sex chromosomes SEX DETERMINING SIGNAL MALE FEMALE Fruitfly XY XX of X: s Mammals XY XX Y(+or) Nematodes x0ⅩX of X: s hermaphrodite Birds ZZ ZW Some reptiles temperature
Fruitfly XY XX # of X’;s Sex chromosomes SEX DETERMINING SIGNAL MALE FEMALE Mammals XY XX Y (+ or -) Nematodes XO XX # of X’;s hermaphrodite Birds ZZ ZW ? Some Reptiles temperature