I was looking over some genetics question and came across this data set.
In the fruit fly Drosophila melanogaster there is a dominant gene b+ for grey body color and another dominant gene c+ for normal wings. The recessive alleles (b,c) of these two genes result in black body color and curved wings respectively.
The question asked about calculation of the recombination frequency.
To me Ada's data set makes sense as the parental type offspring numbers are higher than the recombinant offspring. However, Donald's data set doesn't. Is there any way a recombinant offspring could be in a higher proportion than the parental type offspring?