Asexual reproduction Sexual reproduction

Asexual reproduction Sexual reproduction

Asexual reproduction
Sexual reproduction
อาจารย์ ดร. รัชนีกร ธรรมโชติ
สาขาพันธุศาสตร์
ภาควิชาพฤกษศาสตร์
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Asexual reproduction


One type of cells
No input from another
individual
 No new genetic material
introduced
 No variation in the
offspring
 Offspring = same as the
parent
 “clone”
Sexual reproduction



2 opposite sexes
Info from 2 individuals
Transfer of genetic
materials
 Variation in the
offspring
 Offspring are different
from parents
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Asexual
reproduction
Sexual reproduction
Genetic
Cell
division
Life cycle
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Asexual reproduction Sexual reproduction
Advantage
Disadvantage
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 Budding
 Binary
การแตกหน่อ
fission
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
Parthenogenesis ตัวเมียผลิตไข่ที่ฟักเป็นตัวได้โดยไม่ต้องมี
การปฏิสนธิ
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 Generation
of gametes
 Microspore and megaspore
 Pollination
 Double
fertilization
 Seed development
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fusion
Female
gamete
Male
gamete
Diploid phase
(2n)
Haploid phase
(1n)
meiosis
spore
gametophyte
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http://marzukitm.edublogs.org/category/4-aer/page/2/
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mother cells  meiosis 
pollen grains
 Inside the pollen are 2-3 cells that comprise
the male gametophyte
 microspore
 The tube cell (tube nucleus) develops into
the pollen tube.
 The germ cell  mitosis  2 sperm cells
▪ Division can occur before or after pollination
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http://www.tutorvista.com/content/biology/biology-iii/angiosperm-morphology/fertilization.php
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http://www.tutorvista.com/content/biology/biology-iii/angiosperm-morphology/fertilization.php
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http://www.life.illinois.edu
/bio100/lectures/s10lects/1
0s10-meiosis.html
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1st meiotic
division
2nd meiotic
division
http://www.cjhs.org/teacherssites/taylor/accbio/ReproUnitSites.html
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http://biologywarakwarak.wordpress.com/2011/10/13/sper
matogenesis-and-oogenesis-made-simple/
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



http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/
Angiosperm.html
http://www.biotopics.co.uk/genes1/asexual_and_sexual_re
production.html
http://www.lks.ac.th/bioweb/about/unit11b1.html ภาษาไทย
http://www.wisconline.com/objects/ViewObject.aspx?ID=BIO104
(animation)
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