MEIOSIS DAY 2
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Transcript of MEIOSIS DAY 2
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MEIOSIS DAY 2
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Bellwork
1. Why do kids look similar to, but not identical to their parents?
2. List 2 ways mitosis is different from meiosis.
3. What is the product of meiosis? What is produced
*Be thinking of a compliment for your partner!
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Announcements & PurposeReview meiosisUse book to fill in worksheet
Quiz on Meiosis Thursday
Friday: science fair walk through.
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ClosureReview/improve closure from yesterday! Period 3/5 read and added to it.
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Each of the nucleus of your cells contains all this:
Special cells in your body only have ½ this amount.
Where?Why?
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Long red: mother/chromosome 1Short red:Mother/chromosome 2
Long blue: father/chromosome 1Short blue: father/chromosome 2
Each gamete has:1 MIXED copy of chromosome ONE1 MIXED copy of chromosome TWO
Each somatic cell has:2 copies of chromosome ONE -1 from mom, 1 from dad2 copies of chromosome TWO -1 from mom, 1 from dad
How to create a gamete: MeiosisOr ‘How to create an egg or a sperm’
Make a copy!
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Meiosis Video http://www.youtube.com/watch?v=kVMb4Js99t
A
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Finger Meiosis = 2 (chromatid) chromsomes in each cellHold up 1 pointer finger= this is chromosome 1
from your dad. Hold up other pointer finger= this is
chromosome 1 from your mom =homologous chromosomes
Have them replicate (hold up middle fingers too)
Recombination (mingle them together) Meiosis 1: Pull hands apart Meiosis 2: pull fingers apart= 1 chromatid chromosome in each cell
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Each gamete has:1 MIXED copy of chromosome ONE1 MIXED copy of chromosome TWO
How to create a gamete: MeiosisOr ‘How to create an egg or a sperm’
Make a copy!
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Asexual Reproduction…… involves only one parent. It takes
several forms, but does not involve meiosis.
-Budding -Binary fission-Parthenogenesis
Cnemidophorus neomexicanus
Cylindropuntia bigelovii
Saccharomyces cerevisiae
New Organisms are CLONES
Aka Mitosis
But… if you want something new…
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Sexual Reproduction Two gamete cells, a sperm and an egg,
unite to form a zygote, the single cell from which the organism develops
MEIOSIS is how gametes (sperm and eggs) are made.
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Gametes Are Haploid Gametes (sperm/egg) must have half the
DNA of a normal cell (1 copy) If the DNA in the gametes was not halved,
when they combined the zygote would have more genetic material than the parents
Meiosis is special cell division to make gametes with half the genetic material of the parents
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Gametes have exactly one set of chromosomes, this state is called haploid (1n)
Regular cells (somatic cells) have two sets of chromosomes, this state is called diploid (2n)
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Sperm(1n)
Fertilization Results In A Diploid Zygote
Egg(1n)
Haploidnucleus
Haploidnucleus
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From Zygote to Embryo
Zygote2n
Zygote
2n
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CleavageFrom Zygote to Embryo
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Cleavage = mitosis, but daughter cells don’t split apartFrom Zygote to Embryo
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CleavageFrom Zygote to Embryo
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CleavageFrom Zygote to Embryo
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Finger Meiosis = 2 (chromatid) chromsomes in each cellHold up 1 pointer finger= this is chromosome 1
from your dad. Hold up other pointer finger= this is
chromosome 1 from your mom =homologous chromosomes
Have them replicate (hold up middle fingers too)
Recombination (mingle them together) Meiosis 1: Pull hands apart Meiosis 2: pull fingers apart= 1 chromatid chromosome in each cell
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Crash Course MEIOSIS http://www.youtube.com/watch?
v=qCLmR9-YY7o
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P. 116-117 Use book to fill in front side of worksheet
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ClosureReview/improve closure from yesterday! Period 3/5 read and added to it.