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This is in regards to spermatogenesis.
When does the diploid (46 chromosome) sperm become a haploid?
From my physiology notes, I've got the process as:
1. spermatogonia (diploid = 46 chromosomes) undergoes cell division to primary spermatocyte (still diploid).
2. P. sperm undergoes meiosis I to secondary spermatocyte (still diploid = 46 chromosomes).
3. S. sperm undergoes meiosis II to spermatid (now my sperm is haploid = 23 chromosomes).
BUT. In accordance with wikipedia's notions:
"In spermatocytogenesis, a diploid spermatogonium which resides in the basal compartment of seminiferous tubules, divides mitotically to produce two diploid intermediate cell called a primary spermatocyte. Each primary spermatocyte then moves into the adluminal compartment of the seminiferous tubules and duplicates its DNA and subsequently undergoes meiosis I to produce two haploid secondary spermatocytes."
Wikipedia pretty much says that the gene count goes down to 23 at the SECONDARY spermatocyte, which contradicts my notes.
Can anybody verify this?
Share the wealth. Spread the jizz.
- SS3
When does the diploid (46 chromosome) sperm become a haploid?
From my physiology notes, I've got the process as:
1. spermatogonia (diploid = 46 chromosomes) undergoes cell division to primary spermatocyte (still diploid).
2. P. sperm undergoes meiosis I to secondary spermatocyte (still diploid = 46 chromosomes).
3. S. sperm undergoes meiosis II to spermatid (now my sperm is haploid = 23 chromosomes).
BUT. In accordance with wikipedia's notions:
"In spermatocytogenesis, a diploid spermatogonium which resides in the basal compartment of seminiferous tubules, divides mitotically to produce two diploid intermediate cell called a primary spermatocyte. Each primary spermatocyte then moves into the adluminal compartment of the seminiferous tubules and duplicates its DNA and subsequently undergoes meiosis I to produce two haploid secondary spermatocytes."
Wikipedia pretty much says that the gene count goes down to 23 at the SECONDARY spermatocyte, which contradicts my notes.
Can anybody verify this?
Share the wealth. Spread the jizz.
- SS3