Campbell Biology
Second Canadian Edition
Chapter 13
Meiosis and Sexual Life
Cycles
Copyright © 2018 Pearson Canada Inc. 13 - 1
,Key Concepts
• Offspring acquire genes from parents by inheriting
chromosomes
• Fertilization and meiosis alternate in sexual life cycles
• Meiosis reduces the number of chromosome sets from
diploid to haploid
• Genetic variation produced in sexual life cycles contributes
to evolution
,Concept 13.2: Fertilization and Meiosis
Alternate in Sexual Life Cycles
• A life cycle is the generation-to-generation sequence of
stages in reproductive history of an organism
Start at
zygote
(2n) sexual
maturity
, Concept 13.3: Meiosis Reduces the Number of
Chromosome Sets from Diploid to Haploid
• Like mitosis, meiosis is
preceded by the
replication of
chromosomes,
resulting in sister
chromatids.
Figure 13.7
Second Canadian Edition
Chapter 13
Meiosis and Sexual Life
Cycles
Copyright © 2018 Pearson Canada Inc. 13 - 1
,Key Concepts
• Offspring acquire genes from parents by inheriting
chromosomes
• Fertilization and meiosis alternate in sexual life cycles
• Meiosis reduces the number of chromosome sets from
diploid to haploid
• Genetic variation produced in sexual life cycles contributes
to evolution
,Concept 13.2: Fertilization and Meiosis
Alternate in Sexual Life Cycles
• A life cycle is the generation-to-generation sequence of
stages in reproductive history of an organism
Start at
zygote
(2n) sexual
maturity
, Concept 13.3: Meiosis Reduces the Number of
Chromosome Sets from Diploid to Haploid
• Like mitosis, meiosis is
preceded by the
replication of
chromosomes,
resulting in sister
chromatids.
Figure 13.7
