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Fruit flies, like all insects, are covered with fine, hair-like bristles, which serve as sensory structures. You...

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Biology

Fruit flies, like all insects, are covered with fine, hair-likebristles, which serve as sensory structures.

You discover a male fruit fly, which has short, under-developedbristles.  

You cross this male fly with a female fly with normal bristles.Of 400 progeny, you count 205 flies with normal bristles and 195with short bristles. You cross two F1 flies (both haveshort bristles) and count 400 progeny; 267 have short bristles and133 have normal bristles.

A test cross of the F1 short bristle flies results inthe following results: 195 flies with short bristles and 205 flieswith normal bristles.

A reciprocal cross (short-bristled female flies with normalmales) yields similar results in the F2.

A. Do what of inheritance pattern do you think this trait isshowing ?   

B. What conclusions can you make about the allele causing shortbristles and the genotype of the original male?

C. What is the best explanation for this phenotypic pattern?

I chose

A. Homozygous dominant lethality

B. dominant

C. Individuals with the genotype BB and Bb show SHORT bristles,and those with bb show NORMAL bristles

But I got 4/6 points, not sure which I got wrong.

Answer & Explanation Solved by verified expert
3.7 Ratings (351 Votes)
Answer Given informationA Inheritance pattern Autosomal dominantB Allele causing    See Answer
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