Gametogenesis

Question 1

Explain the process of oogenesis

Answer 1

Occurs in the ovaries.
Diploid oogonia are produced in the ovaries of a female embryo.
Ova are produced from puberty until menopause.
Oogenesis occurs when ovarian follicle develops
Oogonia undergo many mitotic divisions and growth to form primary oocytes
Oocytes are developed by birth by meiosis.
Remain in prophase of meiosis 1 throughout childhood until puberty

When puberty starts, FSH causes primary follicle to continue development of oocytes.

One primary oocyte develops into secondary oocyte and 1st polar body.

The secondary oocyte continues with meiosis in the Graafian follicle and stops at meiosis 2

Ovulation find the secondary oocyte occurs.

If fertilisation occurs, meiosis 2 continues and an ovum and a second polar body are produced.

First polar body disintegrates

Question 2

Name the type or phase of cell division represented by 1,2,3

Answer 2

1: mitosis
2: 1st meiotic division
3: 2nd meiotic division

Question 3

Name parts labeled A-G

Answer 3

A- Germinal epithelium 
B- oogonium
C- primary oocyte
D- polar body
E- secondary oocyte 
F - ovum
G- polar body

Question 4

Give the letter of the structure that is released from an ovary by ovulation

Answer 4

E

Question 5

Explain what happens at the polar bodies

Answer 5

They degenerate

Question 6

Give the letters of the structures that are diploid or haploid

Answer 6

Diploid- D,E, F, G

Haploid - A, B, C

Question 7

Name the structure in human reproductive system, each processes occur

Answer 7

Production of ova - ovary
Meiosis- spermatocytes in seminiferous tubules, primary oocytes in primary follicle
Production- testes
Addition of liquid to sperm to form semen - prostate gland. Cowper’s gland ,seminal vesicle.

Question 8

Explain the process of spermatogenesis

Answer 8

Occurs in the testes from puberty onwards, diploid Spermatogonia occur in the germinal epithelium of the seminiferous tubule;

Spermatogonia divide by mitosis and move to the inside of the tubules to form spermatocytes

Spermatocytes undergo meiosis to form haploid spermatids

Spermatids develop into mature haploid spermatozoa (sperm)