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Transcript
Biology 3rd Block Room 128
Mr. R. Bair Biology Teacher
Mrs. MV Smith Resource Teacher
Date: October 24, 2007
Drill
Why is meiosis important in reproduction?
What is pulled apart in Anaphase I?
What is pulled apart in Anaphase II?
1.
2.
3.
Meiosis: makes cells with ½ of the DNA so that when sperm and egg combine the zygote (fertilized egg) has the
proper # of chromosomes.
Homologous Pairs (tetrad)
Chromotids
Mitosis
5 phases
IPMAT
Makes 2 Diploid
Makes body cells
Somatic
1 division
Both
directed by asters
Both use IPMAT
After IPMAT in Meiosis
The processes are the same
Meiosis
9 phases
IPMATcPMATc
Makes 4 Haploid Cells
Makes sperm & Eggs
Sex cells
2 divisions
Tetrads form crossover occurs