Fruitflies Female XX OMale XY Is sex determined by presence/absence of Y? Is sex determined by number of X's?
Fruitflies 1916 Female XX XXY Male XY XO Sex is determined by number of X's
Sex chromosomes SEX DETERMINING SIGNAL MALE FEMALE Fruitfly XY XX of X';s Mammals XY X Y (+or-) Nematodes XO XX of X';s hermaphrodite Birds 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