lecture 1-20 genetic variation

lecture 1-20 genetic variation - Chapter 13 Life cycles and...

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Chapter 13 – Life cycles and meiosis Learning objectives • Differentiate between asexual and sexual reproduction. • Describe the three types of life cycles of animals, plants, and fungi. • Understand why meiosis is essential to sexual reproduction. • Be able to compare and contrast meiosis with mitosis. • Know what crossing over involves and when it occurs. Explain how the independent assortment of homologous chromosomes during meiosis I leads to increased genetic variation. • Be able to give examples of cells that are formed by mitosis and meiosis. • Terms to know include…tetrad, reduction division, chiasmata, haploid, diploid, genes, gametes, zygote, alternation of generations, synapsis, sporophyte, gametophyte…
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Origins of Genetic Variation Among Offspring – Three Main Mechanisms: 1. Independent assortment of chromosomes 2. Crossing over 3. Random fertilization
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Independent Assortment Of Chromosomes In species that reproduce sexually The behavior of chromosomes during meiosis and fertilization is
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lecture 1-20 genetic variation - Chapter 13 Life cycles and...

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