Reproductive Notes Flashcards
How many babies are born every day?
365,000
How do babies begin?
as 1 cell that then grows into 100 trillion cells
bacteria
- clone themselves to reproduce
- exact copies
- no variation
99% of…
other organisms sexual reproduction
combination of DNA allows for variety
tubes in testicles
1/2 mile long and produce 1000 new sperm every second
each sperm is…
unique
meiosis
- formation of gametes
- cell division that leads to the development of egg or sperm
eggs
- made as a fetus
- few thousand
sperm
produced continually since puberty
ovaries
take turns giving an egg
egg must be…
fertilized within a few hours or it will die
what is the egg covered by?
a protective shell zona
what must a fertilized egg protect itself against?
white blood cells
how many eggs fail to develop?
50%
how many sperm fertilize?
1
how many sperm are in a teaspoon of sperm?
300 million
how many sperm can be less than perfect?
60%
what must the sperm pass?
the cervix, that has mucous plug that becomes watery during ovulation
what are uterine muscles?
they help the sperm reach the filopian tube
what sperm can penetrate the egg?
altered sperm
Placenta has what???
it has villi that take oxygen and nutrients from mothers blood supply
SRY genes
turns on to make a boy
after 2 months
it becomes a fetus and is 1 inch long
18 weeks
sex is determined
