4bmeiosis08

4bmeiosis08 - Where we are going Sources of genetic (DNA)...

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1 Where we are going Sources of genetic (DNA) variations Sexual recombination (Review) Mutation and some others Link variation in morphology with variation in genomes Single and multi-locus traits  (Review) Levels of variation possible Predict frequency of genotypes (phenotypes)  Individuals (Review) Populations How  genomes are selected, sorted and why they accumulate How evolution happens Non-random natural selection Random mechanisms Maintaining variation Special examples of accumulating genomes Sexual selection Kin selection
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2 When this lecture is over you will  Understand the process of meiosis and how this type of cell division  -reduces the n number from 2 to 1 -produces variation in a sexual population. All of these concepts support your understanding of how  variation can occur in a population, providing variation for  evolution.
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3 G1 phase metaphase 1 metaphase 2 telophase 2 S phase G2 phase Sexual recombination: meiosis (a review!!)  How many “sets” of chromosomes in this cell? 2 Which chromosomes make up one set?
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4 G1 phase: Grow to original size and volume S phase: Synthesis of DNA: chromosomes replicate G2 phase: reorganization of cytoskeleton Metaphase 1: Homologous pairs align, separate (reduction) Metaphase 2: Sister chromatids center,  separate G1 phase metaphase 1 metaphase 2 telophase 2 S phase G2 phase Sexual recombination: meiosis (a review!!) 
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5 Let us pause and consider what happens when a chromosome duplicates itself. It makes 
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4bmeiosis08 - Where we are going Sources of genetic (DNA)...

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