Lect 6. Spermatogenesis and Oogenesis Flashcards
Spermatogenesis
(1)____ enter the testes early in development but do not develop into (2)___ until puberty.
Once active, they divide mitotically to create (3)_____.
- Primordial germ cells
- spermatogonia
- primary spermatocytes
Spermatogenesis
Primordial germ cells enter the testes early in development but do not develop into spermatogonia until (1)____.
→ Once active, they divide (2)_____ (mitotically/meiotically) to create primary spermatocytes.
- puberty
- mitotically
Spermatogenesis
How are primary spermatocytes formed?
Primordial germ cells enter the testes early in development but do not develop into spermatogonia until puberty.
→ Once active, they divide mitotically to create primary spermatocytes.
During Spermatogenesis
→ the first phase of meiosis produces
2 secondary spermatocytes.
During Spermatogenesis
→ each secondary spermatocyte completes the second phase of meiosis to form ____
haploid spermatids.
During Spermatogenesis
→ each (1)____ completes the second phase of (2)___ to form haploid spermatids.
- secondary spermatocyte
- meiosis
Spermatids mature into (1)___ in a process called (2)___.
- spermatozoa
- spermiogenesis
Spermiogenesis
→ Identify
Spermiogenesis produces ___
“classic” sperm cell
Spermiogenesis produces “classic” sperm cell
- ___ expanding around nucleus
- mitochondria cluster in middle piece, also called ____
- ___ extending posteriorly from tail piece
- acrosome
- mitochondrial sheath
- flagellum
In the process of Spermiogenesis, each spermatid sheds most of its cytoplasm as ___
residual body
Spermatogenesis
As spermatogonia divide and mature into (1)___, they migrate closer to (2)____; they are not open until (3)___
- spermatozoa
- the lumen of seminiferous tubules
- puberty
Spermatogenesis
As ____ divide and mature into spermatozoa, they migrate closer to the lumen of seminiferous tubules; they are not open until puberty
- spermatozoa
- the lumen of seminiferous tubules
- puberty
Identify cell 1
→ Event?
Spermatogonium - DNA replication
Identify cell 2
→ Event?
Primary spermatocyte - First meiotic division
Identify cell 3
→ Event?
secondary spermatocytes- Second meiotic division
Identify cell 4
Spermatids - Immature haploid gametes
Identify cell 5
Spermatozoa - Haploid gametes
What happen between 2 & 3?
First meiotic division completed
What happen between 3 & 4
Second meiotic division completed
What happen between 4 & 5
Spermiogenesis
Spermatogenesis
Which hormone is necessary for maturation of spermatozoa?
Testosterone