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Chapter 13 Meiosis and Sexual Life Cycles

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Chapter 13 Meiosis and Sexual Life Cycles Meiosis differs from mitosis in three ways: Chapter 13 Meiosis and Sexual Life Cycles Synapsis Crossing over Separating ... – PowerPoint PPT presentation

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Title: Chapter 13 Meiosis and Sexual Life Cycles


1
Chapter 13Meiosis and Sexual Life Cycles
2
Chapter 13Meiosis and Sexual Life Cycles
  • Why
  • sex?

3
Chapter 13Meiosis and Sexual Life Cycles
  • Diversity

4
Chapter 13Meiosis and Sexual Life Cycles
  • Four organisms

5
Chapter 13Meiosis and Sexual Life Cycles
This mutation protects against disease
  • Four organisms

6
Chapter 13Meiosis and Sexual Life Cycles
This mutation protects against disease
This mutation protects against cold
  • Four organisms

7
Chapter 13Meiosis and Sexual Life Cycles
  • They reproduce asexually

8
Chapter 13Meiosis and Sexual Life Cycles
  • They reproduce asexually

9
Chapter 13Meiosis and Sexual Life Cycles
  • They reproduce asexually

10
Chapter 13Meiosis and Sexual Life Cycles
  • A disease comes

11
Chapter 13Meiosis and Sexual Life Cycles
  • A disease comes

12
Chapter 13Meiosis and Sexual Life Cycles
  • Then it gets cold

13
Chapter 13Meiosis and Sexual Life Cycles
  • Then it gets cold

14
Chapter 13Meiosis and Sexual Life Cycles
  • What if they reproduced sexually?

15
Chapter 13Meiosis and Sexual Life Cycles
  • What if they reproduced sexually?

16
Chapter 13Meiosis and Sexual Life Cycles
  • What if they reproduced sexually?

17
Chapter 13Meiosis and Sexual Life Cycles
  • What if they reproduced sexually?

18
Chapter 13Meiosis and Sexual Life Cycles
  • What if they reproduced sexually?

19
Chapter 13Meiosis and Sexual Life Cycles
  • A disease comes

20
Chapter 13Meiosis and Sexual Life Cycles
  • A disease comes

21
Chapter 13Meiosis and Sexual Life Cycles
  • Then it gets cold

22
Chapter 13Meiosis and Sexual Life Cycles
  • Then it gets cold

23
Chapter 13Meiosis and Sexual Life Cycles
  • The population with the most diversity is the
    most likely to leave survivors after
    unpredictable changes.

24
Chapter 13Meiosis and Sexual Life Cycles
  • Each gene has a specific location on a specific
    chromosome.

25
Chapter 13Meiosis and Sexual Life Cycles
  • We inherit one set of chromosomes from our father
    and one set from our mother.

26
Chapter 13Meiosis and Sexual Life Cycles
  • Asexual
  • Sexual

27
Chapter 13Meiosis and Sexual Life Cycles
  • Asexual reproduction produces genetically
    identical offspring by mitosis.
  • Sexual reproduction produces genetically diverse
    offspring.

28
Chapter 13Meiosis and Sexual Life Cycles
  • In humans,
  • 2n 46
  • n 23

29
Chapter 13Meiosis and Sexual Life Cycles
  • In humans,
  • 2n 46
  • n 23
  • 22 pairs are homologous, the 23rd pair is either
    XX or XY.

30
Chapter 13Meiosis and Sexual Life Cycles
  • Gonads (testes and ovaries) produce haploid
    gametes by meiosis

31
Chapter 13Meiosis and Sexual Life Cycles
  • Gonads (testes and ovaries) produce haploid
    gametes by meiosis.
  • Sperm and ovum unite to form a diploid zygote,
    which grows and develops by mitosis.

32
Chapter 13Meiosis and Sexual Life Cycles
  • Sexual life cycles differ in the timing of
    meiosis in relation to fertilization

33
Chapter 13Meiosis and Sexual Life Cycles
  • Sexual life cycles differ in the timing of
    meiosis in relation to fertilization.
  • Multicellular organisms may be diploid or haploid
    or may alternate between haploid and diploid
    generations.

34
Chapter 13Meiosis and Sexual Life Cycles
  • Meiosis differs from mitosis in three ways
  1. Synapsis
  2. Crossing over
  3. Separating homologous pairs (not sister
    chromatids) during anaphase I.

35
Chapter 13Meiosis and Sexual Life Cycles
36
Chapter 13Meiosis and Sexual Life Cycles
37
Chapter 13Meiosis and Sexual Life Cycles
38
Chapter 13Meiosis and Sexual Life Cycles
39
Chapter 13Meiosis and Sexual Life Cycles
  • Genetic variation is the raw material for
    evolution

40
Chapter 13Meiosis and Sexual Life Cycles
  • Genetic variation is the raw material for
    evolution.
  • Mutations create variation

41
Chapter 13Meiosis and Sexual Life Cycles
  • Genetic variation is the raw material for
    evolution.
  • Mutations create variation.
  • Sexual reproduction promotes variation.

42
Chapter 13Meiosis and Sexual Life Cycles
  • Sexual reproduction promotes variation three ways
  • Independent assortment of chromosomes during
    meiosis
  • Crossing over during metaphase I
  • Random fertilization of egg cells by sperm.
  • .
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