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Does a homozygous cross tell us anything about where the genes are with respect to the...

Does a homozygous cross tell us anything about where the genes are with respect to the chromosomes? Explain why or why not.

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Answer #1

Yes, on the basis of homozygous cross. We can tell the position of genes on the chromosome.

This can be explained by use of complementation test. When the two parents homozygous for two different recessive mutation, then on the basis of progeny we can tell the gene position on chromosome.

When the progenies are of wild type, then these two mutations are in different genes on the chromosome.

Similarly, when the mutant progenies are found in the cross, then the two mutations are in same gene.

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