Chapter 13 Meiosis and Sexual Life Cycles - PowerPoint PPT Presentation

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Chapter 13 Meiosis and Sexual Life Cycles

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Chapter 13 Meiosis and Sexual Life Cycles Question? Does Like really beget Like? The offspring will resemble the parents, but they may not be exactly like ... – PowerPoint PPT presentation

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Title: Chapter 13 Meiosis and Sexual Life Cycles


1
Chapter 13 Meiosis and Sexual Life Cycles
2
Question?
  • Does Like really beget Like?
  • The offspring will resemble the parents, but
    they may not be exactly like them.

3
Heredity
4
Genetics
5
Genes
6
Reproduction
7
Asexual Reproduction
8
Asexual Bud
9
Advantages
10
Disadvantages
11
Sexual Reproduction
12
Advantages
13
Disadvantages
14
Question ?
  • Do parents give their whole DNA copy to each
    offspring?

15
Chromosome Number
16
Life Cycle - if Mitosis
  • Female 46 Male 46
  • egg 46 sperm 46
  • Zygote 92
  • mitosis
    mitosis

Mitosis
17
Result
18
Life Cycle - if Meiosis
  • Female 46 Male 46
  • egg 23 sperm 23
  • Zygote 46
  • mitosis
    mitosis

Meiosis
19
Result
20
Meiosis - Purpose
21
Sexual Life Cycle
22
(No Transcript)
23
Ploidy
24
Diploid
25
(No Transcript)
26
(No Transcript)
27
Haploid
28
Polyploids
29
Life Cycle Variations
30
Meiosis/Mitosis Preview of differences
31
Meiosis/Mitosis Preview of differences
32
Meiosis
33
(No Transcript)
34
LE 13-9
MITOSIS
MEIOSIS
Chiasma (site of crossing over)
Parent cell (before chromosome replication)
MEIOSIS I
Propase
Prophase I
Chromosome replication
Chromosome replication
Tetrad formed by synapsis of homologous chromosome
s
Duplicated chromosome (two sister chromatids)
2n 6
Tetrads positioned at the metaphase plate
Chromosomes positioned at the metaphase plate
Metaphase I
Metaphase
Anaphase
Sister chromatids separate during anaphase
Anaphase I
Homologues separate during anaphase
I sister chromatids remain together
Telophase
Telophase I
Haploid n 3
Daughter cells of meiosis I
2n
2n
MEIOSIS II
Daughter cells of mitosis
n
n
n
n
Daughter cells of meiosis II
Sister chromatids separate during anaphase II
35
Prophase I
36
Prophase I
37
Metaphase I
38
Anaphase I
  • .

39
Anaphase I
40
(No Transcript)
41
Telophase I
42
Interkinesis
43
Meiosis II
44
Meiosis - Results
45
(No Transcript)
46
Sexual Sources of Genetic Variation
  • 1.

47
Independent Assortment
48
(No Transcript)
49
Gamete Possibilities
50
Random Fertilization
51
Random Fertilization
52
Result
  • Is it any wonder that two offspring from the same
    human parents only resemble each other and are
    not identical twins?

53
Crossing-Over
54
Chiasmata
55
(No Transcript)
56
Importance
57
Importance
58
Comments
59
Comments
60
Summary
  • Know how the chromosomes separate during Meiosis.
  • Know how Meiosis differs from Mitosis.
  • Know how sexual reproduction increases genetic
    variation.
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