Sex Chromosomes Flashcards
1
Q
Nettie Slevents
A
C/s determination of sex
2
Q
Female
A
22 autosomes and homozygous (although 1 inactivation) XX
3
Q
Male
A
22 autosomes and homizygous pair XY
4
Q
Nettie Theory
A
Unfertilised eggs only X,
Sperm: X or Y
fertilise with an X sperm = female
fertilise with an Y sperm = male
5
Q
XO System
A
Crickets only have X no Y
6
Q
ZW System
A
Birds, fish, butterfly
sex c/s in ova not sperm
male ZZ
female ZW
7
Q
Haplo Diplo
A
bees ants
no sex c/s
female develop from fertilised ova: diploid
male develop from unfertilised ova: haploid
Male 16, Female 32
