6.6 Meiosis and Genetic Variation KEY CONCEPT Independent assortment and crossing over during...
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Transcript of 6.6 Meiosis and Genetic Variation KEY CONCEPT Independent assortment and crossing over during...
![Page 1: 6.6 Meiosis and Genetic Variation KEY CONCEPT Independent assortment and crossing over during meiosis result in genetic diversity.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649cda5503460f949a41da/html5/thumbnails/1.jpg)
6.6 Meiosis and Genetic Variation
KEY CONCEPT Independent assortment and crossing over during meiosis result in genetic diversity.
![Page 2: 6.6 Meiosis and Genetic Variation KEY CONCEPT Independent assortment and crossing over during meiosis result in genetic diversity.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649cda5503460f949a41da/html5/thumbnails/2.jpg)
6.6 Meiosis and Genetic Variation
Cells go through two rounds of division in meiosis.
• Meiosis reduces chromosome number and creates genetic diversity.
![Page 3: 6.6 Meiosis and Genetic Variation KEY CONCEPT Independent assortment and crossing over during meiosis result in genetic diversity.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649cda5503460f949a41da/html5/thumbnails/3.jpg)
6.6 Meiosis and Genetic Variation
Law of independent assortment
allele pairs separate independently of each other during meiosis.
![Page 4: 6.6 Meiosis and Genetic Variation KEY CONCEPT Independent assortment and crossing over during meiosis result in genetic diversity.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649cda5503460f949a41da/html5/thumbnails/4.jpg)
6.6 Meiosis and Genetic Variation
Sexual reproduction creates unique combinations of genes.
• Sexual reproduction creates unique combination of genes.– independent assortment of chromosomes in meiosis– random fertilization of gametes
• Unique phenotypes may give a reproductive advantage to some organisms.
![Page 5: 6.6 Meiosis and Genetic Variation KEY CONCEPT Independent assortment and crossing over during meiosis result in genetic diversity.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649cda5503460f949a41da/html5/thumbnails/5.jpg)
6.6 Meiosis and Genetic Variation
Crossing over during meiosis increases genetic diversity.
• Crossing over - the exchange of chromosome segments between homologous chromosomes.– occurs during prophase I of meiosis I– results in new combinations of genes
Draw the four chromosomes that would result after the above chromosomes go through meiosis.
![Page 6: 6.6 Meiosis and Genetic Variation KEY CONCEPT Independent assortment and crossing over during meiosis result in genetic diversity.](https://reader035.fdocuments.us/reader035/viewer/2022062407/56649cda5503460f949a41da/html5/thumbnails/6.jpg)
6.6 Meiosis and Genetic Variation
• Chromosomes contain many genes.– The farther apart two genes are located on a chromosome,
the more likely they are to be separated by crossing over.
– Genetic linkage- Genes located close together on a chromosome tend to be inherited together
• Genetic linkage allows the distance between two genes to be calculated.