Why do some scientist feel that diarrhea is hereditary?
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Why do some scientist feel that diarrhea is hereditary?
It runs in our “genes”/jeans
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Cell Cycle including Meiosis(known as Gametogenesis)
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Purpose:To create germ cells, gametes or sex cells.
- cells with ½ the number of chromosomes- known as 1N cells-two types of germ cells
-sperm -egg / ova
-in humans 1N/monoploid # =23-contains 1 chromosome from each of the
23 pairs.
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Two types of gametes
Spermatogenesis:-meiosis that takes place in the testicles-produces sperm-made starting at puberty and ends at death-occurs everyday at a rate of 120 to 200 million/day
Male Reproduction
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Oogenesis:-meiosis that takes place in the ovaries-produces ova/eggs-occurs:
-during 2nd month of fetal development-ova stored and released once a month during menstrual cycle -starting at puberty and ending with menopause
-each ovary contain approximately 300,000 eggs.
Female Reproductive
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Gametogenesis1 parent cell divides twice creating four cells with ½ the number of chromosomes.
Parent cell is either a testicle or an ovary cells each starting with 46 chromosomes.
Meiosis I
Meiosis II
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Interphase I
Occurs in testicle or ovary cell, 2N cells
DNA replicates
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Prophase I1. Chromatin supercoils into chromatid2. Centrioles split and form spindle fibers3. Nucleus and nucleolus disassemble4. Homologous pairs of chromosomes pair up
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Homologous Chromosomes
Chromosomes that carry the same set of genes.
One is from your mom and one from your dad.
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Metaphase I1. Homologous pairs of chromosomes move
to the middle of the cells, each pair lines up on one spindle fiber.
2. Chromosomes line up randomly
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Anaphase I1. Homologous pairs of chromosomes split
apart and move away to opposite sides of the cell.
2. Asters push against cell membrane causing the cell to elongate.
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Telophase I with cytokinesis1. Nucleus and nucleolus reform2. Cell divides into two/cytokinesis3. End result is now 2 cells each with 23
replicated chromosomes each.
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Interphase II
DNA does not replicate
The rest of meiosis II is identical to mitosis.
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End result is four cells each with ½ the number of chromosomes.
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