gametogenesis

Question 1

All the oocytes that a female human will have are present by birth. They undergo meiosis but arrest at …… as …

Answer 1

All the oocytes that a female human will have are present by birth. They undergo meiosis but arrest at prophase 1 as primary oocytes

Question 2

All primary oocytes are arrested at Prophase 1 until …

Answer 2

All primary oocytes are arrested at Prophase 1 until the female reaches sexual maturity.

Question 3

Meiosis 1 of oogenesis doesn’t occur until ovulation, at which point 1st polar body is released

Answer 3

Meiosis 1 of oogenesis doesn’t occur until …, at which point ….

Question 4

After ovulation and completion of meiosis 1 the oocyte arrests at … until …. at which point …

Answer 4

After ovulation and completion of meiosis 1 the oocyte arrests at metaphase 2 untl fertilisation at which point 2nd polar body is released

Question 5

describe the development of an oocyte from primordial follicle to tertiary follicle just before ovulaton

Answer 5

primordial follicle, single squamous layer of follicular cells develops to primary follicle under influence of FSH. Primary oocytes enlarge and develop several layers and become more cuboidal. Establishment of ZP. Many develop during each cycle but only some develop into 2ndry follicles, thickening and secretion of fluid of surrounding layer of granulosa cells, oocyte projects into Antrum (central region) of follicle, ovulation by day 13-14. Stimulated by FSH

Question 6

explain the process of spermatogenesis

Answer 6

Pre birth, primordial germ cells multiply and migrate to testis, arrest in G1 as spermatogonia, after spermatogenesis spermatogonia expand by mitosis and give rise to primary spermatocytes. Meiosis begins at puberty, Meiosis 1 gives 2ndry spermatocytes, M2 gives spermatids. Then differentiate to spermatozoa

Question 7

explain the process of spermiogenesis

Answer 7

last stage of spermatogenesis, spermatozoa still attached to sertoli cells