Post on 20-Dec-2015
Meiosis-A prelude to reproduction
I. Terminology
• A. karyotype• B. homologous pairs
• C. diploid condition
D. Terms of chromosome structure
• 1. Dyad• 2. Centromere• 3. Sister chromatids
E. Homologous chromosome pairs
• 1. sister vs. nonsister chromatids
• 2. paternal vs. maternal
F. Genes vs. alleles
How many chromosomes do you see?
83%
17%
0%0%
Enter answer text...
1. 42. 83. 104. No clue
G. Synapsis
1. Definition
2. Forms tetrads
3. Function-analogy of identical twins
4. Crossing over
5. Importance in evolution
H. Diploid vs. haploid
• 1. 2N vs. 1N• 2. Reproductive cells are haploid• 3. Why?• 4. Importance of meiosis
II. Meiosis overview
• A. Two separate divisions– Meiosis I reduction division– Meiosis II “mitotic-like”
division
• B. Where does it occur?– Animals– Plants
• C. What does meiosis produce?– Animals– Plants
III. Meiosis I
• A. Prophase I• B. Metaphase I• C. Anaphase I• D. Telophase I• E. End products
IV. Meiosis II
• A. Prophase II• B. Metaphase II• C. Anaphase II• D. Telophase II• E. Final products
V. Comparison between mitosis and meiosis
Event Mitosis Meiosis I Meiosis II
Synapsis occurs
Sister chromatids separate
Homologous chromosomes separate
Crossing over occurs
Tetrads form
Haploid cells form
Identical daughter cells form