amniotes Flashcards
(9 cards)
1
Q
what do amniotes include?
A
reptiles and mammals
2
Q
how have the eggs adapted?
A
adapted to terrestrial living
3
Q
what membranes do an amniotic egg contain?
A
amnion, chorion, allantois, albumen
4
Q
what does the amnion do?
A
protects and cushions embryo
5
Q
what does the chorion do?
A
surrounds amnion and allows for gas exchange b/w embryo and air
6
Q
what does the allantois do?
A
disposal sac for metabolic wastes produced by embryo
7
Q
what does the albumen do?
A
hydrates embryo and provides protein (egg white)
8
Q
what does the egg yolk do?
A
nourishes embryo
9
Q
what may cover the egg?
A
a hard or leathery external shell
