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33 Cards in this Set
- Front
- Back
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What are the two types of haploid reproductive (germ) cells? |
-Spermatazoa -Ova |
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Haploid |
One copy of every gene (1n) |
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Diploid |
2 copies of every gene (2n) |
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Are humans diploid or haploid? |
Diploid |
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How many chromosomes do humans have? |
46 |
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How many autosomes do humans have? |
44 |
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How many pairs of chromosomes do human have? |
23 |
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Humans have ________copies of every gene |
2 |
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Are all sex choromosomes paired? |
No |
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How many sex chromosomes do humans have? |
2 chromosomes |
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x chromosomes: where are the found and what do they contain? |
Found in both males and females. Contain essential genes |
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Y chromosomes, where are they found and what do they contain? |
Found only in males. Contain genes necessary for male development |
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xx |
female |
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xy |
male |
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Are gametes haploid or diploid? |
Haploid (because humans are diploid) |
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Spermatazoa+Ova=___________ |
zygote |
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Gametogenesis |
Production of gametes from undifferentiated germ cells |
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Gametogenesis involves what two things? |
Mitosis and meiosis |
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What are the two types of gemetogenesis? |
-Spermatogenesis -Oogenesis |
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-Normal cell division -DNA replicated once -Cell divides once |
Mitosis |
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-Cell division to produce gametes -DNA replicates once -Cell divides twice |
Meiosis |
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Hormonal regulation of spermatogenesis |
The hypothalamus releases GnRH, which causes the AP to release the gonadotropins LH and FSH |
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What does FSH stimulate? |
Gamatogenesis |
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What does LH stimulate? |
Androgen secretion |
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For males, what cells does FSH stimulate to start gametogensis |
Sertoli cells |
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Where are sertoli cells found? |
In the seminiferous tubules |
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What do leydig cells secrete? |
Testosterone |
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What happens in the seminiferous tubules? |
The site of initial sperm production |
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Is spermatogonium 1n or 2n |
2n |
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What process makes primary spermatocytes? |
mitosis |
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What process makes secondary spermatocytes? |
Meiosis I |
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What process makes spermatids? |
Spermatid |
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After spermatids differentiate, they become what? |
spermaozoa |
