A cell has alleles A and a at one locus. If a double strand break occurs within the A allele and gap repair synthesis is used to repair the break, what is the expected genotype after repair?

aa

Explanation:

The expected genotype after repair will be aa.

This can be explained by the fact that,  the double strand(DNA structure) that have the information about A allele is lost because of  the breakage, the DNA repair enzymes have the capability to synthesize the lost allele similar to allele of that gene present on their corresponding chromosomes.

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sorry if this did not , have a great day!