You are interested in three linked Drosophila genes (B, R, and D) to understand their relative location along a chromosome. You perform a test cross between parents with known genotypes BbRrDd...

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Extracted text: You are interested in three linked Drosophila genes (B, R, and D) to understand their relative location along a chromosome. You perform a test cross between parents with known genotypes BbRrDd (phenotype BRD) and bbrrdd (phenotype brd). The BbRrDd individual was the offspring of two completely homozygous parents (BBRRDD and bbrrdd). The number of offspring with each phenotype are shown in the table below. Note that phenotypes are written as italicized letters representing dominant (capital) or recessive (lower case) phenotypes. For example, the individual BrD has the dominant phenotypes for genes B and D and the recessive phenotype for gene R. Phenotype BRD # Offspring 281 BrD 68 BRd Brd bRD bRd brD brd 22 121 137 65 14 292 Total Number of Offspring: 1,000 Based on the data above, which of these genes (B, R, or D) is in the middle of the other two, along the chromosome? R These three genes are not all on the same chromosome O You cannot determine this location given only offspring phenotype numbers B