28.3 Oogenesis and the Sexual Cycle A. Oogenesis 1. Female is born with about ov

Question

28.3 Oogenesis and the Sexual Cycle A. Oogenesis 1. Female is born with about ova suspended in of the first meiotic division. 2. Layers of cells surrounding ova 3. At puberty, female has aboutova in her ovaries; will ovulate about in her lifetime. 4. Egg development sequence (stage before and at birth) a. b. C. d. (stage change at puberty) (ovulated) (after fertilization) 5. Follicular development sequence (immature follicle) (maturation) a. b. c. secondary (maturing) follicle d. e. (stage@ ovulation) (remnant of follicle after ovulation)

Explanation / Answer

Answer

A.

Oogenesis : Oogenesis the process of developing primary egg cell into mature ovum. It takes place in the female gonads, the ovaries.

1. Female is born with about 1- 2 million ova suspended in ovaries of the first meiotic division.

2. Layers of cells surrounding ova = Corona radiata

3. At puberty, female has about 3 to 4 lacs ova in her ovaries; will ovulate about 300 - 400 in her lifetime.

4. Egg development sequence
a. Oogonium
b. Primary oocyte (arrested at prophase-i) -------> primary oocyte (Completion of meisosis - i)
c. Secondary oocyte
d. Secondary oocyte (arrested at metaphase- ii)  -----> Completion of meiosis- ii by secondary oocyte

5. Follicular development sequence
a. Primordial follicle
b. Primary follicle
c. secondary follicle
d. Mature follicle
e. Corpus luteum

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