2. AP Biology The Chromosomal Basis of Inheritance “Linked Genes”

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

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

5. 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 +

6. 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

7. 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?

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

9. AP Biology Any Questions?