Purebreed lines of fruit flies with wild type (tan) body color and stubbly brist

Question

Purebreed lines of fruit flies with wild type (tan) body color and stubbly bristles are mated to flies with ebony bodies and normal bristles. The resulting F1 offspring all have normal wild-type body color and stubbly bristles. The F1 flies are crossed with flies recessive for both traits (i.e. ebony bodies and normal bristles).

Assume you found the following results amount offspring:

Wild,stubby bristles 424

ebony, stubby bristles 58

wild type body,normal bristles 62

ebony body,normal bristles 456

How would you explain these results?

Explanation / Answer

This is an example of back cross.

Wild,stubby bristles(.4) : bony, stubby bristles(0.05) :wild type body,normal bristles (0.06) : ebony body,normal bristles 0.4)

but it doesnt follow the mendelian pattern. this shows linkage between genes.

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