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You are investigating two traits in fruit flies controlled by one gene each.

You are investigating two traits in fruit flies controlled by one gene each. The b gene controls for body

color (black or brown), while the r gene controls for body sculpture (rugose or smooth). After crossing rugose black flies with smooth brown flies, you obtain an F1 generation of 100% rugose black flies.

What are the dominant alleles?

What are the genotypes of the two parent flies to perform a dihybrid test cross?

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Of the two parent flies, identify the genotype of the tester fly (0.5 pt):

After running a dihybrid test cross, you find 1000 offspring with the following phenotypes:

Phenotype Observed Expected

Black, rugose 42  

Black, smooth 504

Brown, rugose 372

Brown, smooth 82

1000

1000

Fill in the expected column with the expected number of offspring in each class of phenotypes.

What phenotype classes represent the recombinant offspring?

Calculate the relative genetic distance between the body color gene and the body sculpting gene (show your work, including units where applicable).

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