spermatogenesis & oogenesis

Question 1

spermatogenesis

Answer 1

Occurs in testes
Immature diploid sperm cells go through mitosis
Meiosis produces haploid spermatocytes
Sperm are continuously formed
Make several million sperm per day - about 1,500 per second

Question 2

oogenesis

Answer 2

Occurs in ovaries
Egg development begins before birth. Females are born with 2 million immature egg cells.
Eggs are NOT continuously produced (menopause occurs around age 51)
Women ovulate (release one egg per month)

Question 3

oogenesis has an

Answer 3

Unequal division of cytoplasm

Question 4

oogenesis produces

Answer 4

one mature ovum (egg)
There polar bodies will die

Question 5

in vitro fertilization

Answer 5

Fertility drugs cause release of many egg cells rather than just one.
The eggs are harvested and placed in a petri dish.
The eggs are fertilized with sperm.

Question 6

Fertilized eggs are allowed to begin dividing..

Answer 6

and then they are implanted.
This procedure often results in multiple births.

Question 7

amniocentesis

Answer 7

Often done when there is suspicion of genetic abnormality
Cells taken from amnion
Look for cells in metaphase
Organize information as a karyotype for analysis

Question 8

identical twins

Answer 8

One egg is released and fertilized.
As it divides this egg splits in
two and each
develops.

Question 9

fraternal twins

Answer 9

Two eggs are released at the same time
Each gets fertilized by a different sperm