In a dihybrid cross, 2000 individuals are produced in F${}_2$ generation. Approximately, how many will be phenotypically different from parents?

The correct option is D 750
The ratio of parental to non parental combinations (recombinants) is 10:6 in F${}_2$ generation of dihybrid cross. In the dihybrid cross mentioned here, 2000 individuals are produced in F${}_2$ generation, hence phenotypically different progenies i.e., number of recombinants will be $\frac{6}{16}\times 2000=750$.