Reproductive Notes Flashcards
1
Q
How many babies are born every day?
A
365,000
2
Q
How do babies begin?
A
as 1 cell that then grows into 100 trillion cells
3
Q
bacteria
A
- clone themselves to reproduce
- exact copies
- no variation
4
Q
99% of…
A
other organisms sexual reproduction
combination of DNA allows for variety
5
Q
tubes in testicles
A
1/2 mile long and produce 1000 new sperm every second
6
Q
each sperm is…
A
unique
7
Q
meiosis
A
- formation of gametes
- cell division that leads to the development of egg or sperm
8
Q
eggs
A
- made as a fetus
- few thousand
9
Q
sperm
A
produced continually since puberty
10
Q
ovaries
A
take turns giving an egg
11
Q
egg must be…
A
fertilized within a few hours or it will die
12
Q
what is the egg covered by?
A
a protective shell zona
13
Q
what must a fertilized egg protect itself against?
A
white blood cells
14
Q
how many eggs fail to develop?
A
50%
15
Q
how many sperm fertilize?
A
1
