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Mendels_Laws - cell contains a pair of homologous...

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Unformatted text preview: / cell contains a pair of . . homologous chromosomes Top figure: Shows Mendel’s first law with one pair of ' ”“91"“! with alternative alleles r tni homologous chromosomes. Alleles segregate ‘A “d “’ °’ " ‘ during meiosis, The two alleles, “A” anda “ " of a trait (gene) end up in different cells. DNA duplicate. prior to meiosis 1 Bottom figure: Shows Mendel’s second law with two pair of homologous chromosomes. Alleles of chromosome, composed of unlinked genes assert independently. An allele XA ax t“ “mm“d‘ of a particular trait (gene) can end up with either of the two alleles from the other homologous chromosome pair. \jmm 1 Note: Mendel knew nothing about chromosomes or genes. What he looked at was the phenotypic numbers and patterns in $313.?” each generation. He actually worked separate and backwards to figure out that the “factors" and“ segregate of inheritance for a physical characteristic (a phenotype) had to occur in pairs. \mim I, only one homologue is present in a gamete or spore W alleles and up in different gametes I! spores four types of gametes ...
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