You can skip question 3 For question 7 one way is through ch

You can skip question 3. For question 7 one way is through chromatography, but whats the other. In the pathway 2 is scarlett and 3 is the brown gene

Biochemical Pathway for Drosophila Strain. Phenotype Eye Pigment brick- red. eyes If the ommochrome pathway is interrupted, the percentage of brown pigments in the eye will decrease, and so the eye will be a redder White white eyes Color Sepia If the pteridine pathway is interrupted, the eye will be more brown. than the wildtype eye Pteridine Brown brown pathway pathway Tryptophan (Colorless precursor 1 comesponds GTP (Colorless precursor that needs to be imported into the cell) to transport that needs to be imported into the cell Scarlett bright red. protein) 2-amino-4-hydroxypterdine Apricot orange (blue) Xanthopterin (blue-green Brown pigments Before analyzing your tetrahydroiopterin chromatography, can you guess in which biopterin drosopterin sepiapterin isoxamthopterin (violet-blue) lue (yellow) red-orange) pathway each strain. might be mutant based on their phenotype isosepiapterin yellow)

Solution

So there are two parallel pathways to produce the eye color. There is a brown pathway that produces a red pigment, and a scarlet pathway that produces a brown pigment. The names might be a bit confusing (they always are for my students), but it’s part of a standard genetics convention: the genes are named for their effect in mutants, not wild type forms. If you knock out the brown gene with a mutation, the fly will be unable to make the red pigment, but it will still make the brown pigment, so the eye will look brown. See? Makes perfect sense