BIOL 3P34 Lecture Notes - Lecture 7: Ploidy, Spermatocyte, Sox9
8 Jan 2018
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Document Summary
How can xx men man the sry gene. Due to translocation of pieces of y on to the x. Reduces number of chrom and allows recombination between paternal and maternal. Meiosis has crossing over (mom and dad chrom) and putting them apart into different 4 daughter haploid cells. Begins at puberty, has 3 phrases (spermatogonia, spermatocytes, spermatids) Undifferentiated cells are outside, differentiated cells are in the lumen, inside. Stertoli cells (hub cells) are attached to spermatogonium and divide to gonium. Sertoli undergo meiosis and become spermatocyte and undergo morphological changes to become sperm cells. Spermatogenesis picture = differentiate from one type cell to another. 2n= diploid 4c= during s phase, the gene doubles. Cells progress from outside to inside of a lumen. Earliest stages are closest to outer wall, most mature stages are closest to lumen. Difference from sperm= females have meiotic divisions that release smaller polar bodies.
