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9 Cards in this Set
- Front
- Back
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Scrotum |
2-3 degrees lower than core body temperature Cremaster muscles contract to pull testes close Dartos muscles contract to tighten scrotum |
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Testes |
Tunica albuginea located deep to tunica vaginalis and form 200-300 lobules spermatogenesis carried out by seminiferous tubules |
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Spermatogenesis |
Begins with spermatogonia and diploid number of chromosomes Each cell has two sets of chromosomes and said to diploid Gametes only have 23 chromosomes and said to be haploid |
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Interphase |
Two nuclear divisions halve the number of chromosomes |
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Prophase 1 |
Homologous chromosomes undergo synapsis tetrads are formed with homologous partners Crossing over takes place |
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Metaphase 1 |
Tetrads line up at the spindle equator |
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Anaphase 1 |
Homologous chromosomes composed of joined sister chromatids are distributed to opposite ends of the cell |
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Telophase 1 |
Nuclear membrane forms around chromosomal masses Spindle break down Chromatin reappears |
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Meiosis II |
Mirrors mitosis except chromosomes are not replicated before it begins |
