AP Biology The Chromosomal Basis of Inheritance “Linked Genes”

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AP Biology The Chromosomal Basis of Inheritance “Linked Genes”

AP Biology Thomas Morgan Why me? Because I have White eyes I am Drosophila melangaster

AP Biology Linked Genes  Morgan thought that 2 traits would be inherited together the closer they are

AP Biology P Generation (homozygous) Wild type (gray body, normal wings ) Double mutant (black body, vestigial wings)  b b vg vg b + b + vg + vg +

AP Biology P Generation (homozygous) Wild type (gray body, normal wings ) Double mutant (black body, vestigial wings)  b b vg vg Double mutant TESTCROSS  b + b + vg + vg + F 1 dihybrid (wild type) b + b vg + vg

AP Biology P Generation (homozygous) Wild type (gray body, normal wings ) Double mutant (black body, vestigial wings)  b b vg vg Double mutant TESTCROSS  b + b + vg + vg + F 1 dihybrid (wild type) b + b vg + vg Testcross offspring Eggs b + vg + b vg b + vg b vg + Black- normal Gray- vestigial Black- vestigial Wild type (gray-normal) b vg Sperm b + b vg + vg b b vg vg b + b vg vg b b vg + vg Morgan not only found the parental phenotypes he was looking for but some nonparental genotypes What does this mean?

AP Biology Morgan discovered a way to map genes “Genetic Linkage Map”

AP Biology Any Questions?

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