A heterozygous fruit fly with normal wings and a gray body $($VvBb$)$ is crossed with homozygous flies with vestigial wings and black bodies $($vvbb$).$ Out of $800$ total F$1$ progeny, $296$ are normal gray, $328$ are vestigial black, $99$ are normal black, and $77$ are vestigial gray. What is the best explanation for this result?

The loci for wing length and body color are on different chromosomes.

The loci for wing length and body color are on sex chromosomes.

Mendel$$s principle of independent assortment accounts for this.

The loci for wing length and body color are on the same chromosome.

Mendel$$s principle of segregation accounts for this.