Biology

In the common fruit fly, Drosophila, flies homozygous dominant for gray body and normal wings were crossed with flies that were homozygous recessive for black body and small wings. The F1 offspring were test-crossed with these results:

gray, normal wings: 410
gray,small wings: 95
black,normal wings: 105
black,small wings: 390

This data indicates which of the following?

___ A. The genes for body colour and wing size are different chromosomes
____ B. The genes for body colour and wing size are completely linked ( next to each other on the chromosome)
____ C. Genes for body colour and wing size are linked and are 10 units apart on the chromosome.
_____ D. Genes for the body colour and wing size are linked and are 20 units apart on the chromosome.


Explain your choice carefully.



 

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