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

Question

You are investigating two traits in fruit flies controlled by one gene each. The b gene controls for body color, while the r gene controls for body sculpture. After crossing rugose black flies with smooth brown flies, you obtain an F1 generation of 100% smooth black flies. What are the dominant alleles? (1 pt) What should be the genotype of the tester individual be to perform a dihybrid test cross? (2 pt) After running a dihybrid test cross, you find 1000 offspring with the following phenotypes: Phenotype Black, rugose Black, smooth Brown, rugose Brown, smooth Expected Observed 396 102 98 404 1000 Fill in the expected column with the expected number of offspring in each class of phenotypes. (1 pt) What phenotype classes represent the recombinant phenotypes? (1 pts each) Calculate the relative genetic distance between the genes controlling for body color and body sculpting. (1 pt).

Explanation / Answer

Suppose color represents as AA and body structure represents as BB

So, 9 will be black smooth flies

3 will be black rugose flies

3 will be brown smooth flies

1 will be brown rugose fly

3.

Expected Expected black smooth 400 black rugose 250 brown smooth 250 brown rugose 100

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