Genetics and adaption

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1. Sexual reproduction is the means by which genetic variation is maintained in a population.
2. Meiosis is the process by which haploid gametes are formed.
3. During Meiosis, new combinations of existing genes arise by independent assortment of chromosomes and crossing over between homologous chromosomes.
4. If an F2 generation with a phenotypic ratio of 9:3:3:1 is obtained as a result of a dihybrid cross where the F1 is self crossed, the two genes involved must be located on different chromosomes.
However when the expected ration of 9:3:3:1 is not obtained, this indicates that the two genes are located on the same chromosome (i.e. are linked).
5. If an F2 generation with a ration of 1:1:1:1…


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