The Testes Gamete Development (sperm) Hormonal Production (testosterone) Male Reproductive Biology.
Mini Lesson#4 Meiosis - Ms. Bellino's Websitebellino.weebly.com/.../mini_lesson4_meiosis_2.pdf ·...
Transcript of Mini Lesson#4 Meiosis - Ms. Bellino's Websitebellino.weebly.com/.../mini_lesson4_meiosis_2.pdf ·...
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Mini Lesson#4 Meiosis
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MEIOSIS- Sexual Reproduction
gamete/sex cells(eggs and sperm) are
Produced through Meiosis.
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Meiosis Only Takes Place at— Male
–Testes
– Sperm cell Formation
Number of Chromosomes
-23(Half)
Female
- Ovaries
– Egg cell Formation
Number of Chromosomes
-23 (Half)
Each cell is unique and different !!!
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Meiosis divides twice!!
Gametes have half the # of chromosomes
compare to body cells
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Meiosis
sexual reproduction
Two divisions (meiosis I and meiosis II).
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Meiosis I Four phases:
a. prophase I
b. metaphase I
c. anaphase I
d. telophase I
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Meiosis 2 Four phases:
a. prophase ll
b. metaphase Il
c. anaphase Il
d. telophase Il
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Crossing Over (During Prophase I)
Create Genetic Variations!!
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Prophase I
http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter28/animation__unique_features_of_meiosis.html Crossing Over
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Meiosis I & Meiosis II
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How is Meiosis different from Mitosis?
Mitosis Meiosis Type of reproduction
Number of divisions
Number of daughter cells
Kind of cells
Chromosome number
Similarity of offspring
Crossing over?
Visual
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How is Meiosis different from Mitosis?
Mitosis Meiosis Type of reproduction
Asexual Reproduction Sexual Reproduction
Number of divisions 1 division 2 divisions
Number of daughter cells 2 daughter cells 4 daughter cells
Kind of cells
ALL Cells except sex cells Gametes, Sex Cells ( egg cells and sperm cells) ONLY
Chromosome number Same (ex: Parent-46 Daughter- 46)
Half (ex: Parent-46 Daughter- 23)
Similarity of offspring Identical Different from parents - Variation
Crossing over?
No Yes. Exchanging partial chromosomes
Visual