MEIOSIS 11-4 Making gametes… .
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Transcript of MEIOSIS 11-4 Making gametes… .
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MEIOSIS11-4
Making gametes…
http://waynesword.palomar.edu/lmexer2a.htm
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Planaria animation: http://www.t3.rim.or.jp/~hylas/planaria/title.htmFamily http://babyhearing.org/Parenet2Parent/index.asp
Remember from Chapter 1:CHARACTERISTICS OF LIVING THINGS ALL LIVING THINGS __________
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ASEXUAL REPRODUCTIONBacteria reproduce using__________________________________
Budding & regeneration are used by plants and animals to reproduce asexually (mitosis)
http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookmito.html
http://fig.cox.miami.edu/~cmallery/150/mitosis/c7.13.2.hydra.jpg
Planaria animation: http://www.t3.rim.or.jp/~hylas/planaria/title.htm
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MITOSIS
Produces cells that are __________ copies of parent cell
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ADVANTAGES OF ASEXUAL REPRODUCTION
Can make offspring faster
Don’t need a partner
http://www.mrgrow.com/images/cutting.jpg
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DISVANTAGES OF ASEXUAL REPRODUCTION
ALL ALIKE
Species CAN’T change and adapt
One disease can wipe out whole population
http://www.mrgrow.com/images/cutting.jpg
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SEXUAL REPRODUCTION
Combines genetic material
from 2 parents (sperm & egg)
so offspring aregenetically __________ from parents
Family image from: http://babyhearing.org/Parenet2Parent/index.asp
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ADVANTAGES OF SEXUAL REPRODUCTION
Allows for variation in population
Individuals can be different
Provides foundation for EVOLUTION
Allow species adapt to changes intheir environment
http://naturalsciences.sdsu.edu/classes/lab8/spindex.html
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EGG + SPERM
If egg and sperm had same number of chromosomes as other body cells . . . baby would have too many chromosomes!
http://www.angelbabygifts.com/Image by Riedell Image by Riedell
http://www.acmecompany.com/stock_thumbnails/13217.forty-six_chromosomes.jpg
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MEIOSIS is the way…
to make cells with ½ the number of chromosomesfor sexual reproduction
http://waynesword.palomar.edu/lmexer2a.htm
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Click the image to play the video segment 11A.
Video 1
Meiosis Overview
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DIPLOID & HAPLOIDMost cells have 2 copies of each
chromosome = ______________(one from mom; one from dad)
All BODY (___________) cells are diploid
HOMOLOGOUSCHROMOSOMES
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DIPLOID & HAPLOID
Some cells have only one copy of each chromosome = _____________
All sperm and egg cells are haploid
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MITOSIS•Makes ___ cells genetically _________ to parent cell & to each other
•Makes ___ cells•Makes __________•Used by organisms to: increase size of organism, repair injuries, replace worn out cells
http://waynesword.palomar.edu/lmexer2a.htm
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MEIOSIS•Makes ____ cells
genetically different from parent cell & from each other
•Makes _____ cells•Makes ______________
•Used for ____________
http://waynesword.palomar.edu/lmexer2a.htm
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WHAT MAKES MEIOSIS DIFFERENT ?
1. SYNAPSIS & CROSSING OVER (PROPHASE I)
2. SEGREGATION & INDEPENDENT ASSORTMENT
(ANAPHASE I)
3. Skip INTERPHASE II (NO S) CELL DIVIDES TWICE, BUT…
ONLY COPIES DNA ONCE
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WHAT MAKES MEIOSIS DIFFERENT ?
1.Homologous chromosomes pair up during ____________= ______________
Images modified from: http://www.emc.maricopa.edu/faculty/farabee/BIOBK/Crossover.gif
This group of FOUR (4)chromatids is called a_________________
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WHAT MAKES MEIOSIS DIFFERENT?
1. Exchange of DNA betweenhomologous pairs = _____________during PROPHASE I
Allows shuffling of genetic material
http://www.emc.maricopa.edu/faculty/farabee/BIOBK/Crossover.gif
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• Click the image to play the video segment. 11E
Video 5
Crossing Over
SEE CROSSING OVERANIMATION
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HOMOLOGOUS CHROMOSOMES
Image modified by Riedell • SAME SIZE• SAME SHAPE• CARRY GENES for the
SAME TRAITS• BUT ______________! (Don’t have to have
the SAME CHOICES)
http://sps.k12.ar.us/massengale/genetics%20tutorial.htm
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CROSSING
OVER
Image modified by Riedell
• Allows for_________________in different combinations
• After crossing over, chromatid arms are________________ anymore
http://sps.k12.ar.us/massengale/genetics%20tutorial.htm
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WHAT MAKES MEIOSIS DIFFERENT ?
2.Separation during ANAPHASE I
_______________________
Separates gene choices and allows shuffling of genetic material
__________________ &
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Click the image to play the video segment 11D.
Video 4
Segregation of Chromosomes
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SEGREGATION(Anaphase I)
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SEGREGATION & CROSSING OVERtogether make even more
combinations
See ananimation
http://waynesword.palomar.edu/lmexer2a.htm
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INDEPENDENT ASSORTMENT
http://fig.cox.miami.edu/~cmallery/150/mitosis/c13x9independent-assortment.jpg
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INDEPENDENT ASSORTMENTat ANAPHASE I
Lots of different combinations are possible!
This is why you don’t look exactly like your brothers and sisters even though you share the same parents!
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http://www.tokyo-med.ac.jp/genet/anm/mimov.gi
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WHAT MAKES MEIOSIS DIFFERENT ?
Crossing over Segregation Independent assortment
are ALL ways MEIOSIS results in =______________________________
So daughter cells are ______________from parents and from each other
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WHAT MAKES MEIOSIS DIFFERENT ?
3. Skip INTERPHASE II (No S) CELL DIVIDES TWICE, BUT … ONLY COPIES ITS DNA ONCE
G1 G2S P M A T C
G1
MITOSIS:
MEIOSIS:
S G2 P M A T CP M A T C
( I )
( II )
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Video 2
Click the image to play the video segment 11B. & C
Video 2
Animal Cell Meiosis, Part 1 & Part 2
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Go to Section:
Section 11-4
Figure 11-15 Meiosis
Meiosis I
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Go to Section:
Meiosis II
Meiosis I results in two haploid (N) daughter cells, each with half the number of chromosomes as the original.
Prophase II Metaphase II Anaphase II Telophase IIThe chromosomes line up in a similar way to the metaphase stage of mitosis.
The sister chromatids separate and move toward opposite ends of the cell.
Meiosis II results in four haploid (N) daughter cells.
Section 11-4
Figure 11-17 Meiosis II
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MITOSIS vs MEIOSISINTERPHASE INTERPHASE I
• DNA is spread out as chromatin• Nuclear membrane/
nucleolus visible• DNA is copied during S phase• Makes stuff new cell needs in G2
_______________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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MITOSIS vs MEIOSIS PROPHASE PROPHASE I
DNA scrunches into chromosomes
Nuclear membrane/ nucleolus disappearCentrioles/
spindle fibers appear
DNA scrunches into chromosomesNuclear membrane/ nucleolus disappear Centrioles/spindle fibers appear _________________________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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MITOSIS vs MEIOSIS METAPHASE METAPHASE I
• Chromosomes line up in middle
Chromosomes line up in middle
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
______________________________
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MITOSIS vs MEIOSIS ANAPHASE ANAPHASE I
APART:Chromatids split
APART:
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
Chromatids stay together________________________
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MITOSIS vs MEIOSIS TELOPHASE TELOPHASE I
See TWO nucleiNuclear membrane/ nucleolus returnDNA spreads out as chromatinSpindle/centrioles disappear
____________________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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MITOSIS vs MEIOSIS CYTOKINESIS CYTOKINESIS I
Cytoplasm splits
into 2 cells
______________________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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MITOSIS vs MEIOSIS INTERPHASE II
• DNA is spread out as chromatin• Nuclear membrane/
nucleolus visible• DNA is copied during S phase
______________________________________________________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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MITOSIS vs MEIOSIS PROPHASE PROPHASE II
• DNA scrunches into chromosomes
• Nuclear membrane/nucleolus disappear
• Centrioles/ spindle fibers appear
____________________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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MITOSIS vs MEIOSIS METAPHASE METAPHASE II
• Chromosomes line up in middle ______________________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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MITOSIS vs MEIOSIS ANAPHASE ANAPHASE II
Chromatids split and move apart
__________________________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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MITOSIS vs MEIOSIS TELOPHASE TELOPHASE II
Two nucleiNuclear membrane/
nucleolus returnsCentrioles/spindle fibers
disappearDNA spreads out as chromatin
_______________________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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MITOSIS vs MEIOSIS CYTOKINESIS CYTOKINESIS II
Cytoplasm splits _____________________
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
http://www.pbs.org/wgbh/nova/baby/divi_flash.html
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Ways Meiosis is different?• Homologous pairs match up & trade DNA
(SYNAPSIS & CROSSING OVER) in PROPHASE I
•SEGREGATION
& INDEPENDENT ASSORTMENT in Anaphase I
create genetic recombination• Skipping INTERPHASE II- (Dividing TWICE but copying DNA once)
produces 1n cells
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MAKING SPERM & EGGS
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___________________= MAKING MATURE SPERM
Mature & grow flagella
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Sperm provides DNA
All the starting nutrients, organelles, molecule building blocks, etc. have to come from the egg.
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Produces: 1 “good” egg
3 __________
CYTOPLASM DIVIDES UNEVENLY
__________________ = MAKING a MATURE EGG
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Sperm donates mostly DNA
http://bestweekever.blogs.com/photos/uncategorized/imagemain_sperm_egg1_1.gif
WHY MAKE ONLY ONE “GOOD” EGG?
Most of the cell parts and nutrients needed for baby come from EGG!
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“Self digest”
Using ________________
POLAR BODIES DEGENERATE (DIE)
= __________________ “cell suicide” for good of organism