TD BA N°1 Corrected
1)
A: Primordial Follicle |
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B: Primary Follicle |
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C: Secondary Follicle |
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D: Tertiary Follicle 2) |
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Legends of the Graafian Follicle:
Legend | |
|---|---|
A: Corona Radiata | |
B: Cumulus Oophorus | |
C: Antrum | |
D: Secondary Oocyte (haploid) | |
E : Theca Externa | |
F: Granulosa | |
G: Theca Interna 3) |
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Stage | Description |
Primordial Follicle | Primary Oocyte + 1 layer of follicular cells |
Primary Follicle | Zona pellucida |
Secondary Follicle | Granulosa + Theca interna |
Tertiary Follicle | Antrum + Theca externa |
Graafian Follicle | Increase in antrum volume |
4)
Mitosis | Meiosis |
Involves only somatic (body) cells | Involves only sex cells (gametes) |
Takes place throughout the body | Takes place only in the gonads |
Occurs in a single phase | Occurs in two phases (Meiosis I and Meiosis II) |
Maintains the same number of chromosomes | Reduces the chromosome number by half during Meiosis I |
Results in 2 genetically identical diploid daughter cells | Results in 4 genetically different haploid daughter cells (due to crossing over) |
5)
Spermatogenesis | Oogenesis |
Takes place in men’s testes | Takes place in women’s ovaries |
Occurs from puberty to death (continuous process) | Begins in the embryonic stage, halts during childhood, resumes at puberty, and stops at menopause |
One spermatogonium (diploid) produces 16 spermatozoa (haploid) | One primary oocyte (diploid) produces one secondary oocyte (haploid) |
The multiplication phase lasts 27 days, continuously from puberty to death (spermatogonia stock is always renewed) | The multiplication phase occurs during the embryonic period (formation of the primary oocyte stock) |
Meiosis lasts 24 days, and is continuous from puberty to death | Meiosis begins during the embryonic period, lasts for years, and is completed only upon fertilization, it is discontinuous |