Chapter 1: Exploring Life



Chapter 13: Meiosis and Sexual Life Cycles

• Intro- heredity, variation, genetics

13.1 Offspring acquire genes from parents by inheriting chromosomes

• Inheritance of Genes- genes, locus, gametes

• Comparison of Asexual and Sexual Reproduction- asexual reproduction, clone, sexual reproduction

Concept Check 1,2,3

13.2 The Fertilization and meiosis alternate in sexual life cycles

• Intro- life cycle

• Sets of Chromosomes in Human Cells- somatic cell, 46 chromosomes, karyotype, homologous chromosomes, homologues, maternal, paternal, XX, XY, autosomes, diploid, 2n, 46, sister chromatids, haploid, n, 23, ovum, sperm

• Behavior of Chromosome Sets in the Human Life Cycle- meiosis, fertilization, zygote

• The Variety of Sexual Life Cycles- multicellular organism, alternation of generations, sporophyte, spores, gametophyte

Concept Check 1,2,3,4

13.3 Meiosis reduces the number of chromosome sets from diploid to haploid

• Intro- meiosis I, meiosis II, four daughter cells

• The Stages of Meiosis- synapsis, nonsister chromatids, tetrad, chiasmata, prophase I, metaphase I, anaphase I, telophase I, cytokinesis, prophase II, metaphase II, anaphase II, telophase II, cytokinesis, decondensing,

• A Comparison of Mitosis and Meiosis- synapsis and crossing over, paired homologous pairs, homologous chromosomes… separate

Concept Check 1,2

13.4 Genetic variation produced in sexual life cycles contributes to evolution

• Origins of Genetic Variation Among Offspring- mutations, independent assortment, crossing over, recombinant chromosomes, random fertilization

• Evolutionary Significance of Genetic Variation Within Populations- genetic variations

Concept Check 2

Testing Your Knowledge 1, 2, 3, 4, 5, 7, 8, 9, 10

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