Without this process life would cease to exist because it is the first step in energy transfer from the sun.
2 answers:
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***see pic***
In this problem we have two different genes that we are accounting for. Remember that for every gene we have have 2 alleles (alternative copies of the gene, each offspring gets 1 from each parent for a total of 2). Therefore, when we are writing our genotypes for the parents/offspring we will be dealing with 4 total alleles (2 different genes x 2 alleles for each gene = 4 alleles in our genotype).
This 4-letter genotype makes our Punnet Square pretty hefty. It will be a 16-square PS (4-letter genotype of parent #1 x 4 letter-genotype of parent #2 = 16 boxes in PS).
Before setting up your Punnett Square, do the following:
1. Determine the genotypes of the parents. (***see pic for helpful notes***)
2. Determine the 4 possible combinations of the alleles for each gene. This part looks very confusing. It's not though! If you're familiar with "FOIL"ing in Algebra, that's basically all your doing. (***see pic for helpful notes, tried using red/black lines to distinguish between genes***)
3. Set up Punnett Square with 4 possible allele combinations for each gene.
4. Complete Punnett Square.
*Repeat Steps #1-4 because this problem asks us about F2 offspring, meaning the "second generation" of offspring"
5. Analyze offspring ratios.
ANSWER: I got 150 flies. Not sure if you accidentally wrote the wrong answer choice, or if you are just supposed to choose the closest answer choice, but either way it's C!
