46.2 Fertilization Flashcards
1
Q
fertilization
A
union of sperm and egg
2
Q
external fertilization
A
female releases eggs into the environment
-then male fertilizes them
3
Q
internal fertlization
A
sperm deposited in the female reproductive tract
4
Q
spawning
A
individuals clustered in the same area release gametes at the same time
5
Q
signals that trigger spawning
A
- chemical signals by one individual triggers others to release
- environmental cues for the entire group (day length, temperature)
6
Q
when external fertilization doesn’t occur all at the same time, then
A
courtship occurs to bring male and female together
7
Q
pheromones
A
chemicals released by one organism that can influence of individuals of the same species
8
Q
internal vs external: offspring care
A
internal: more parental care/ more survival mechanisms
external: lots of offspring/ more die
9
Q
eutharian mammals
A
- embryo remains in uterus throughout fetal development
- nourished by mother’s blood through placenta
