catalyst: how are sex cells (sperm + egg) different from body cells? reflection: meiosis
TRANSCRIPT
![Page 1: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/1.jpg)
Catalyst: How are sex cells (sperm + egg) different from body cells?
Reflection:
Meiosis
![Page 2: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/2.jpg)
MEIOSIS11-4
Making gametes…
http://waynesword.palomar.edu/lmexer2a.htm
![Page 3: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/3.jpg)
Planaria animation: http://www.t3.rim.or.jp/~hylas/planaria/title.htmFamily http://babyhearing.org/Parenet2Parent/index.asp
Remember:CHARACTERISTICS OF LIVING THINGS ALL LIVING THINGS __________
REPRODUCE
![Page 4: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/4.jpg)
Catalyst: How are sex cells (sperm + egg) different from body cells?
Reflection:
Meiosis
Asexual Reproduction: Producing offspring by a single parent without combining genes from another individual. The offspring are clones of the parent.
![Page 5: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/5.jpg)
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
BINARY FISSION
![Page 6: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/6.jpg)
ADVANTAGES OF ASEXUAL REPRODUCTION
•Can make offspring faster
•More energy efficient, no sperm and egg cells
•Don’t need a partner
http://www.mrgrow.com/images/cutting.jpg
![Page 7: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/7.jpg)
DISADVANTAGES 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
![Page 8: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/8.jpg)
Catalyst: How are sex cells (sperm + egg) different from body cells?
Reflection:
MeiosisAsexual Reproduction: Producing offspring by a single parent without combining genes from another individual. The offspring are clones of the parent.
-No sperm and egg cells, only 1 parent, use mitosis, offspring are clones.
![Page 9: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/9.jpg)
SEXUAL REPRODUCTION
Combines genetic material
from 2 parents (sperm & egg)
so offspring aregenetically __________ from parents
DIFFERENT
Family image from: http://babyhearing.org/Parenet2Parent/index.asp
![Page 10: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/10.jpg)
Catalyst: How are sex cells (sperm + egg) different from body cells?
Reflection:
MeiosisAsexual Reproduction: Producing offspring by a single parent without combining genes from another individual. The offspring are clones of the parent.-No sperm and egg cells, only 1 parent, use mitosis, offspring are clones.
Sexual Reproduction: Producing offspring by combining genes from 2 parents. Not identical to parents, lots of variation.
![Page 11: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/11.jpg)
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
![Page 12: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/12.jpg)
DISADVANTAGES OF SEXUAL REPRODUCTION
• Need to find a suitable partner-takes energy to find/court a mate
• Genetic recombination can allow for harmful recessive traits to re-appear
• Less efficient• Females at a disadvantage
-energy cost of carrying and rearing young
http://naturalsciences.sdsu.edu/classes/lab8/spindex.html
![Page 13: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/13.jpg)
Catalyst: How are sex cells (sperm + egg) different from body cells?
Reflection:
MeiosisAsexual Reproduction: Producing offspring by a single parent without combining genes from another individual. The offspring are clones of the parent.-No sperm and egg cells, only 1 parent, use mitosis, offspring are clones. Sexual Reproduction: Producing offspring by combining genes from 2 parents. Not identical to parents, lots of variation.
-Sperm and egg cells, 2 parents, use meiosis to create sex cells, offspring are not identical to parents.
![Page 14: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/14.jpg)
MEIOSIS is the way…
to make cells with ½ the number of chromosomesfor sexual reproduction
http://waynesword.palomar.edu/lmexer2a.htm
![Page 15: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/15.jpg)
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
![Page 16: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/16.jpg)
Click the image to play the video segment 11A.
Video 1
Meiosis Overview
![Page 17: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/17.jpg)
Catalyst: How are sex cells (sperm + egg) different from body cells?
Reflection:
MeiosisAsexual Reproduction: Producing offspring by a single parent without combining genes from another individual. The offspring are clones of the parent.-No sperm and egg cells, only 1 parent, use mitosis, offspring are clones. Sexual Reproduction: Producing offspring by combining genes from 2 parents. Not identical to parents, lots of variation. -Sperm and egg cells, 2 parents, use meiosis to create sex cells, offspring are not identical to parents.
Mitosis Meiosis
![Page 18: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/18.jpg)
MITOSIS•Makes ___ cells genetically _________ to parent cell & to each other
•Makes __________•Used by organisms to: increase size of organism, repair injuries, replace worn out cells
http://waynesword.palomar.edu/lmexer2a.htm
2identical
2nSOMATIC (body)
![Page 19: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/19.jpg)
MEIOSIS•Makes ____ cells
genetically different from parent cell & from each other
•Makes _____ cells•Makes ______________
•Used for ____________
4
haploid
Gametes (sperm & eggs)
sexual reproduction
http://waynesword.palomar.edu/lmexer2a.htm
![Page 20: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/20.jpg)
Mom
23 chromosomes
Dad
23 chromosomes
You have 23 pairs of chromosomes223 possible different combinations of chromosomes
70 trillion different possible offspring!!! Mathematically, this means that a SINGLE MATING PAIR
of humans could produce MORE VARATIONS OF OFFSPRING THAN THE TOTAL NUMBER OF HUMANS
BEINGS THAT HAS EVER LIVED!!!
![Page 21: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/21.jpg)
Catalyst: How are sex cells (sperm + egg) different from body cells?
Reflection:
MeiosisAsexual Reproduction: Producing offspring by a single parent without combining genes from another individual. The offspring are clones of the parent.-No sperm and egg cells, only 1 parent, use mitosis, offspring are clones. Sexual Reproduction: Producing offspring by combining genes from 2 parents. Not identical to parents, lots of variation. -Sperm and egg cells, 2 parents, use meiosis to create sex cells, offspring are not identical to parents.
Mitosis Meiosis
Chromosomes 1-22 (autosomes) contain genes for proteins to produce almost everythingThe last chromosomes determine your sex
![Page 22: Catalyst: How are sex cells (sperm + egg) different from body cells? Reflection: Meiosis](https://reader035.vdocuments.us/reader035/viewer/2022062722/56649f275503460f94c3f082/html5/thumbnails/22.jpg)
Catalyst: How are sex cells (sperm + egg) different from body cells?
Reflection: what are the main differences of sexual and asexual reproduction create a case where it is an advantage to have one or the other?
Meiosis