Suppose that out of 1000 offspring’s in the generation of a dithered cross, 748 are tall and hairy, 6 are tall and smooth, 4 are short and hairy and 242 are short and smooth. what is the explanation for this kind of ratio ?

A. Linkage and crossing over
B. Presence of multiple alleles
C. Presence of lethal genes
D. Sex-linkage