The offspring were all wild-type. The double mutant would have separated in around half of these backcrosses had it had a wild phenotype.
Children with a different allele combination than their parents are known as recombinant offspring. Recombination, or the sorting of alleles into novel combinations, occurs when genetic material is exchanged during prophase I of meiosis. A method whereby DNA strands are cut apart and put back together to create novel allele combinations. The frequency of recombinant phenotypes in a population will typically be lower than that of non-recombinant phenotypes, or the relative frequency of recombinant phenotypes will depend on the distance between connected genes, allowing for the identification of the recombinant progeny.
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