Cross A: Brown eye gene (br) is syntenic with bent wing gene (bt), located 20 mu

Question

Cross A: Brown eye gene (br) is syntenic with bent wing gene (bt), located 20 mu apart on chromosome 4. (Wildtype eyes are red and wildtype wings are straight) Cross B: Black body gene (b) on chromosome 3 and the purple body gene (pr) is on chromosome 2. (wildtype bodies are grey and wild type eyes are red) Assume mutations are recessive. Brown eyes = br Bent wings = bt Red eyes = Br+ Straight Wings = Bt+ What are the genotypes (P1) of Cross A: (brown eyes, bent wings x wildtype) Cross B: (Gray body, purple eyes x black body, red eyes)

Explanation / Answer

A: (brown eyes, bent wings x wildtype) Brown eye bent wing red eyes straight wings (brbtBr+Bt+) B: (Gray body, purple eyes x black body, red eyes) (BBBr+) where BB = grey body

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