Meiosis

1
Meiosis

• Meiosis I
• Meiosis II

2
Meiosis I

• Interphase I
• Prophase I
• Metaphase I
• Anaphase I
• Telophase I

3
Meiosis II

• Interphase II
• Prophase II
• Metaphase II
• Anaphase II
• Telophase II

4
Mitosis
5
Meiosis
6
Meiosis I
7
Meiosis II
8
Diploid Cell 2N 4 Two Homologous Chromosomes
9
Interphase 1DNA is synthesized during the S phase
10
Prophase I (1)The duplicated chromosomes
condense and become visible. (2) Spindle forms.
11
(3) The nucleolus disperses(4) The nuclear
membrane disperses
12
(5) Homologous chromosomes pair
13
(6) and cross over
14
Metaphase IPaired homologous chromosomes align
at the metaphase plate
15
Anaphase IThe homologues separate from each
other, but sister chromatids remain linked at
their centromeres
16
Telophase I Cytokinesis that follows produces 2
daughter cells, each has 2 chromosomes consisting
of 2 sister chromatids
17
Prophase II
18
Metaphase II
19
Anaphse II
20
(No Transcript)
21
Telophase II
22
(No Transcript)
23
Identify the following phase
24
Identify the following phase
25
Identify the following phase
26
Identify the following phase
27
Question 1

• Homologous chromosomes
• Pair up during meiosis
• Are in pairs, one chromosome of each pair comes
  from the father and one from the mother
• May exchange parts during meiosis
• All the above

28
Questions 2 3 True/False

• Question 2 Asexual reproduction produces
  variations
• Question 3 Sexual reproduction produces
  variations

29
Answers

• Question 1 D
• Question 2 F
• Question 3 T