A geneticist conducts a 2-point test cross between two linked genes on Drosophila for body color (wild type gray, b+ and mutant black, b) and wing shape (wild type normal, vg+ and mutant vestigial, vg). She wants the heterozygote for the test cross to be in the repulsion (trans) configuration. What original P generation parents must she cross to create her heterozygote for the test cross?
a) b+b+/vgvg x bb/vg+vg+
b) b+b+/vg+vg+ x bb/vgvg
c) b+b/vg+vg x bb/vgvg
d) b+b+/vg+vg+ x b+b+/vg+vg+
Ans: a) b+b+/vgvg x bb/vg+vg+
Biology & Microbiology
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