อาจารย์ ดร. รัชนีกร ธรรมโชติ
สาขาพันธุศาสตร์
ภาควิชาพฤกษศาสตร์
1
Asexual reproduction
Sexual reproduction
Asexual reproduction
One type of cells
No input from another individual
No new genetic material introduced
No variation in the offspring
Sexual reproduction
2 opposite sexes
Info from 2 individuals
Transfer of genetic materials
Variation in the offspring
3
Asexual reproduction
Sexual reproduction
Genetic
Cell
division
Life cycle
Asexual reproduction Sexual reproduction Advantage
Disadvantage
Budding การแตกหน่อ
Binary fission
5
Parthenogenesis ตัวเมียผลิตไข่ที่ฟักเป็นตัวได้โดยไม่ต้องมี
การปฏิสนธิ
7
Generation of gametes
Microspore and megaspore
Pollination
Double fertilization
Seed development
9
meiosis fusion
gametophyte Female
gamete Male gamete
spore
Diploid phase (2n)
Haploid phase
(1n)
microspore mother cells meiosis pollen grains
Inside the pollen are 2-3 cells that comprise the male gametophyte
The tube cell (tube nucleus) develops into the pollen tube.
The germ cell mitosis 2 sperm cells
▪ Division can occur before or after pollination
11
http://www.tutorvista.com/content/biology/biology-iii/angiosperm-morphology/fertilization.php 13
http://www.cjhs.org/teacherssites/taylor/accbio/ReproUnitSites.html 15
1st meiotic division
2nd meiotic division
17
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.wisc-
