Drosophila Notation & Genetics (Dihybrid Cross)

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sammikins

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I'm working on a biology lab and I'm confused as how to calculate/predict the F2 generation. Below is an example provided of how the F2 generation was calculated but I'm not sure how to get the fractions for each gender. For example, I did a dihybrid cross and got 1/2 of the males are wildtype for both traits but I don't know how they got "1/2 x 3/4 = 3/8".

(Scalloped wing was determined to be sex-linked recessive while lobed eyes were autosomal recessive.)

upload_2018-2-27_19-19-4.png

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