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19 Cards in this Set
- Front
- Back
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Process of gamete formation? |
Gametogenesis (halves the number of chromosomes) |
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Gametogenesis: female= ______ (___ chromosomes= ________)
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-Eggs -23 -HAPLOID |
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Gamatogenesis: male= ______ (____ chromosomes= _______) |
-Sperm -23 -HAPLOID |
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2 series of nuclear division? |
-Meiosis I -Meiosis II |
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Crossing over occurs= no 2 gametes alike!?
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Meiosis I |
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Meiosis I: male= produce what? |
2 haploid secondary spermatocytes |
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Meiosis: female= produce what? |
Haploid secondary oocyte and polar body |
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Meiosis II: male produce what? |
4 distinct haploid spermatids |
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Meiosis II: female produces what? |
ONLY IF FERTILIZED: 2nd polar body and ovum (ova and sperm DNA combine to yield diploid zygote) |
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Reduces chromosomal number by by half? |
Meiosis (diploid 2n ----> haploid 1n) |
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Through _______, meiosis yields genetic variability ! No 2 gametes are alike! |
Crossing over (during prophase I ) |
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Meiosis only occurs in ______; Mitosis (haploid 1N w/ 23 chromosomes ----> diploid 2N w/ 46 chromosomes) proceeds after ________. |
-Gametes -Fertilization |
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Human sperm production; meiosis of sperm? |
Spermatogenesis |
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Where does spermatogenesis occur? |
Seminiferous Tubules |
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Primary spermatocyte (2N) ----> Secondary spermatocyte (N)? |
Spermatogenesis |
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1 spermatocyte makes ____ function sperm. |
4 |
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Oogenesis: development of egg and follicle are two separate processes. About 500,000 oogonia produced as fetus (______ supply). |
Lifetime
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Oogenesis: Meiosis I begins during ________ and stops at _________. At ________,Meiosis I completes with 1 ________ and 1 _________.
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-Fetal period -Prophase I -Puberty -Secondary oocyte -Polar body |
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Oogenesis: Meiosis II completes only if ________ occurs. Ends with product of 1 ______ and 1 ________. |
-Fertilization -Ovum -Polar body |
