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To make the punnet's square first we need to combine the allele to obtain the gametes possibilities. Then we make the cross to obtain the possible offspring
1 DdEE x 2 Ddee
Gametes:
1: DE / DE / dE / dE
2: De / De / de / de
Now we obtain the phenotypic ratios:
Given that dd/ee = deafness then:
4/16 of the offspring will have congenital deafness because of the genotype: ddEe specifically because of the dd alleles.