Oogenesis

Question 1

T/F. In contrast to spermatogenesis, the process of oogenesis is largely not completed at birth.

Answer 1

False. Largely completed at birth

Question 2

Oogonia are derived from the ____, & each oogonium is the central cell in a developing ____.

Answer 2

primordial germ cells; follicle

Question 3

By about the third month of fetal life, the oogonia have become _____, and some of these have already entered the _____.

Answer 3

primary oocytes; prophase of first meiosis

Question 4

During oogenesis the primary oocytes remain in suspended in ____ until sexual maturity.

Answer 4

prophase (dictyotene)

Question 5

This is the stage of meiosis at w/c the primary oocyte is arrested in the female fetus during the period from late fetal life through birth and childhood until ovulation occurs.

Answer 5

Dictyotene

Question 6

T/F. During oogenesis, as each individual follicle matures and releases its oocyte into the Fallopian tube, the second meiotic division is completed.

Answer 6

False. First meiotic division. Second meiotic division is not completed until after fertilization in the Fallopian tube.

Question 7

The first and second meiotic divisions result in an unequal division of the cytoplasm forming structures known as?

Answer 7

Polar bodies

Question 8

Completion of the first meiotic division in the female may take over ____ years.

Answer 8

40 years.

Question 9

T/F. Whereas spermatogenesis produces four viable sperm per meiotic division, oogenesis produces only one ovum.

Answer 9

True

Question 10

The maximum number of germ cells in the female fetus is ____ at 5 months. By birth, the number is _____. By puberty it is less than ____. Of this number, only about ____ will ovulate.

Answer 10

6.8 x 10^6; 2 x 10^6; 200, 000; 400

Question 11

T/F. The long resting phase during the first meiotic division may be a factor in the increased risk of failure of homologous chromosomes to separate during meiosis (non-disjunction) in the older mother.

Answer 11

True