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The formation of sperm is called __?__.
Spermatogenesis
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The formation of eggs is called __?__.
Oogenesis
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Sperm and eggs are called __?__.
Gametes
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The formation of sperm or eggs is called __?__.
Gametogenesis
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The process by which spermatids form sperm is called __?__.
Spermiogenesis
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How many chromosomes do primary spermatocytes have?
46
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Are those chromosomes in primary spermatocytes duplicated or unduplicated?
Duplicated
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How many chromosomes do spermatids have?
23
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Are those chromosomes in spermatids duplicated or unduplicated?
Unduplicated
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Name the cell that divides by meiosis II (spermatogenesis).
Secondary spermatocyte
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Name the cell that divides by meiosis I (spermatogenesis).
Primary spermatocyte
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Name the cell that divides by mitosis (spermatogenesis).
Spermatogonium
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In which organ does sperm formation takes place?
Testes
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Nurse cells are also called __?__ or __?__ cells.
Sertoli; sustentacular
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What is the function of nurse cells?
- Blood-testes barrier
- Provide nutrients for developing cells
- Produce chemicals needed for spermatogenesis
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Name the tube in which spermatogenesis takes place.
Seminiferous tubules
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Are the least mature sperm closest to or furthest from the lumen of the tube in which spermatogenesis takes place?
Furthest
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For each primary spermatocyte to undergo the process of sperm formation, how many sperm are formed?
4
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How long does the process of sperm formation take?
64-72 days
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About how many sperm does a mature male produce per day?
400 million
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Do spermatognium A or B mature into primary spermatocytes?
B
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Do spermatognium A or B undergo mitosis?
A
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Are spermatognium A or B further from the lumen of the tube in which spermatogenesis takes place?
A
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How many chromosomes do primary oocytes have?
46
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Are the chromosomes in primary oocytes duplicated or unduplicated?
Duplicated
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How many chromosomes do first polar bodies have?
23
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Are the chromosomes in first polar bodies duplicated or unduplicated?
Duplicated
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Name the cell that divides by meiosis II (oogenesis).
Second oocyte, First polar body
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Name the cell that divides by meiosis I (oogenesis).
Primary oocyte
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Name the cell that divides by mitosis (oogenesis).
Oogonium
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In which organ does egg formation take place?
Ovaries
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Name the structures in which egg formation take place. These structures are within the organ in which egg formation take place.
Follicles
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How many eggs are formed, at best, for each primary oocyte to undergo the process of egg formation?
1
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When does mitosis of oogonia stop?
5th month of gestation
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When mitosis of oogonia stops, how many oogonia does the female fetus have?
6-7 million
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When a baby girl is born: name her egg cells. These eggs are arrested in __?__.
Primary oocyte; Prophase I
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About how many egg cells does a female baby have at birth?
2 million
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About how many egg cells does a girl have at puberty?
400,000
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Name the cell that is ovulated.
Secondary oocyte
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In which phase is the egg cell that is ovulated arrested in?
Metaphase II
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Name the cell that is fertilized.
Secondary oocyte (divides into ovum)
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In which phase is the egg cell that is fertilized arrested in?
Metaphase II
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An ovum is formed only if __?__ takes place.
sperm penetration
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During meiosis I and meiosis II, there is an uneven division of __?__.
cytoplasm
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Why is there an uneven division of cytoplasm during meiosis I and meiosis II?
Because it ensures that the penetrated egg has nutrients o its 7 day journey to the uterus.
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