Oogenesis

Question 1

Control of gametogenesis in oogenesis?

Answer 1

Hypothalamus secretes GnRH

GnRH stimulates FSH and LH from anterior pituitary cells

FSH stimulates development of follicles and secretion of oestrogens

LH stimulates maturation of follicles and release of ova at ovulation

Question 2

What are the basics of oogenesis?

Answer 2

Diploid primary oocyte turns into a secondary oocyte (which is haploid) and a polar body - after meiosis 1

Secondary oocyte and first polar body under meiosis 2 to form haploid ovum and 3 polar bodies

Ovum becomes egg to be fertilised - cytoplasm is conserved in secondary oocyte so only that becomes egg

Question 3

What is the role of oestrogen in oogenesis?

Answer 3

Enhances growth of follicles and grows endometrium

Question 4

What is the role of progesterone in oogenesis?

Answer 4

Grows and maintains endometrium for pregnancy

Secretes nutrients for embryo

Question 5

What are the basics of fruit fly oogenesis?

Answer 5

Happens distal to proximal

Egg production starts in larvae

Eggs take a few days to mature

Released into uterus for fertilisation

Egg is laid even in not fertilised

Oviparous