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15 Cards in this Set
- Front
- Back
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Gametes |
Sex cells, egg and sperm, that join in fertilization |
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Phenotype |
An organisms observable characteristic |
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Alleles |
Genes found on the same spot on the same chromosome in different individuals coding for subtle variations in the same protein |
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Haploid |
Half the number of chromosomes found normally in a cell |
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Spermatocyte |
Primary sperm that is split into by two divisions into 4 sperm after meiosis |
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Polar Bodies |
Extra dna ejected out after meiosis in female |
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Where are sperm produced? |
In the testes, where accessory glands add secretion to nourish it along delivery |
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Gonads |
Organs that produce gametes |
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Ducts |
transport gametes |
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Warming of the testes |
Muscles contract when cold to bring gonads closer to body and relax when temperatures are hot since sperm can only be produced in a narrow range of temperatures |
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Cryptorchidism |
Medical term where the testes do not descend upon birth. Happens in 3% of fully developed babies and 30% of premature ones |
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Seminiferous tubules |
Composites of the testes, densely packed tubules contained in 200-300 lobules. Each lobule holds up to 3 tubules |
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Spermatogenic cells and Sertoli cells |
Cells lining the seminiferous tubules that produce sperm. Spermatogonia along the walls of the tubules split into primary spermatocytes and later secondary spermatocytes and then spermatids. Sertoli cells now have to protect these spermatids which are targeted by the bodies immune system. Sertoli cells also provide nourishment and assist in final maturation by removing excess cytoplasm |
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Leydig cells |
interstitial endocrinocytes, produce the hormone testosterone. |
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testosterone |
Hormone that stimulates production of sperm, stimulates bone growth, increases hair production, stimulates growth of larynx, and increase libido. |
