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Complete and Incomplete Linkage

Crossing over...

Question

Crossing over results in.

A

Recombination between linked genes

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B

Linkages between genes

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C

Segregation of genes

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D

Dominance of genes

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Solution

The correct option is A Recombination between linked genes
During crossing over non-sister homologous chromosome exchange genes. Hence, it leads to recombination.

So, the correct answer is 'Recombination between linked genes'.

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Q. Assertion :The maximum frequency of recombination, that can result from crossing over between linked genes, is 50 percent. Reason: Linked genes shown higher frequency of crossing over if distance between them is longer.

Crossing over results in separation of incompletely linked genes

Q. A scientist performed the gene mapping experiments in maize. He mapped the genes on chromosomes on the basis of % crossing over between different genes. One map unit corresponds to one % crossing over or recombination. The genes showing more than 50% recombination were not supposed to be linked on same chromosome. In crossing over studies on maize, scientist observed the following % crossing over between genes A, B, C, D: between A and D 10%, between A and C 3%, between genes C and D 7%, between genes A and B 5%, and between genes C and B 8%. On the basis of above observation, find out the correct sequence of genes A, B, C and D on chromosomes.

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