Discuss The Process Of Spermatogenesis And Spermiogenesis

Question 1

What is spermatogenesis?

Answer 1

Process of the formation of male gametes in the testes (sperm). Haploid spermatozoa develop from gern cells in seminiferous tubules of the testis.

Question 2

What happens in early foetal development in relation to spermatogenesis?

Answer 2

Primordial gern cells differentiate into spermatogonia. These remain dormant until puberty.

Question 3

What is the 1st stage of spermatogenesis?

Answer 3

1. Primordial germ cells differentiate into spermatogonium.
2. Through mitosis, spermatogonium divides into primary spermatocytes.

Question 4

What is the 2nd stage of spermatogenesis + spermiogenesis?

Answer 4

1. (Meiosis 1 - dna replication & crossing over). 1 Primary spermatocytes divide into 2 secondary spermatocytes.
2. (Meiosis 2 - each chromosome has 2 chromatids, 1 goes into each spermatid). 2 Secondary spermatocytes divide into 4 spermatids. These then go through spermiogenesis and become spermatozoa.

Question 5

What is the composition of sperm?

Answer 5

1. Head
   - acrosome: contains enzymes required for penetration of oocyte.
   - nucleus: contains chromosomes
2. Mid piece
   - contains mitochondria which supply energy to the sperm.
3. Tail
   - flagellum to transport sperm.