Chapter 13 Meiosis and Sexual Life Cycles

1
Chapter 13Meiosis and Sexual Life Cycles
2
Concept Check Questions Offspring acquire genes
from parents by inheriting chromosomes

• How are the traits of parents (such as hair
  color) transmitted to their offspring?

3
Concept Check Questions Offspring acquire genes
from parents by inheriting chromosomes

• How are the traits of parents (such as hair
  color) transmitted to their offspring?

4
Concept Check Questions Offspring acquire genes
from parents by inheriting chromosomes

• In the absence of mutation, asexually reproducing
  organisms produce offspring that are genetically
  identical to each other and to their parents.
  Explain.

5
Concept Check Questions Offspring acquire genes
from parents by inheriting chromosomes

• In the absence of mutation, asexually reproducing
  organisms produce offspring that are genetically
  identical to each other and to their parents.
  Explain.

6
Concept Check Questions Offspring acquire genes
from parents by inheriting chromosomes

• In organisms that reproduced sexually, how
  similar are the offspring to their parents?
  Explain.

7
Concept Check Questions Offspring acquire genes
from parents by inheriting chromosomes

• In organisms that reproduced sexually, how
  similar are the offspring to their parents?
  Explain.
• 50

8
Concept Check Questions Offspring acquire genes
from parents by inheriting chromosomes

• In organisms that reproduced sexually, how
  similar are the offspring to their parents?
  Explain.
• 50

9
Concept Check Questions Offspring acquire genes
from parents by inheriting chromosomes

• In organisms that reproduced sexually, how
  similar are the offspring to their parents?
  Explain.
• 50

10
Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles

• How does the karyotype of a human female differ
  from that of a human male?

11
Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles
How does the karyotype of a human female differ
from that of a human male?
12
Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles

• How does the alternation of meiosis and
  fertilization in the life cycles of sexually
  reproducing organisms maintain the normal
  chromosome count for each species?

13
Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles

• diploid
• diploid

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Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles

• diploid
• meiosis
• haploid
• haploid
• meiosis
• diploid

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Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles

• diploid
• meiosis
• haploid
• fertilization diploid
• haploid
• meiosis
• diploid

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Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles

• Dog sperm contain 39 chromosomes. What are the
  haploid number and diploid number for dogs?

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Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles

• Dog sperm contain 39 chromosomes. What are the
  haploid number and diploid number for dogs?
• n39 2n78

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Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles

• What process (meiosis or mitosis) is more
  directly involved in the production of gametes in
  animals? In plants most fungi?

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Concept Check Questions Fertilization and
meiosis alternate in sexual life cycles

• What process (meiosis or mitosis) is more
  directly involved in the production of gametes in
  animals? In plants most fungi?
• meiosis mitosis

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Concept Check Questions Meiosis reduces the
number of chromosome sets from diploid to haploid

• Using the concept of chromosome sets, explain
  briefly how mitosis conserves chromosome number,
  whereas meiosis reduces the number of chromosomes
  by half.

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Concept Check Questions Meiosis reduces the
number of chromosome sets from diploid to haploid
mitosis
2 sets

• 2
• sets

4 sets
2 sets
22
Concept Check Questions Meiosis reduces the
number of chromosome sets from diploid to haploid
1 set
meiosis
1 set
2 sets

• 2
• sets

4 sets
1 set
2 sets
1 set
23
Concept Check Questions Meiosis reduces the
number of chromosome sets from diploid to haploid

• How are the chromosomes in a cell at metaphase of
  mitosis similar to and different from the
  chromosomes in a cell at metaphase of meiosis II?

24
Concept Check Questions Meiosis reduces the
number of chromosome sets from diploid to haploid

• How are the chromosomes in a cell at metaphase of
  mitosis similar to and different from the
  chromosomes in a cell at metaphase of meiosis II?
• Twice as many,
• otherwise identical

25
Concept Check Questions Genetic variation
produced in sexual life cycles contributes to
evolution

• Fruit flies have a diploid number of 8, and
  honeybees have a diploid number of 32. Assuming
  no crossing over, is the genetic variation among
  offspring from the same two parents likely to be
  greater in fruit flies or in honeybees? Explain.

26
Concept Check Questions Genetic variation
produced in sexual life cycles contributes to
evolution

• Fruit flies have a diploid number of 8, and
  honeybees have a diploid number of 32. Assuming
  no crossing over, is the genetic variation among
  offspring from the same two parents likely to be
  greater in fruit flies or in honeybees? Explain.
  
• 232 gt 28

27
Concept Check Questions Genetic variation
produced in sexual life cycles contributes to
evolution

• Under what circumstances would crossing over
  during meiosis not contribute to genetic
  variation among daughter cells?

28
Concept Check Questions Genetic variation
produced in sexual life cycles contributes to
evolution

• Under what circumstances would crossing over
  during meiosis not contribute to genetic
  variation among daughter cells?
• Parent is homozygous
• for every gene.
• .