Sexual reproduction leads to

The term “linkage” was coined by

For the preparation of genetic maps, the recombination frequencies between genes are additive over short distances but not over long distances due to

How many types of gametes will be produced by a $O$ Drosophila having following arrangement of
two genes ($y*$ and $w*$) on $X-$chromosome?

In Drosophila, long wing and broad abdomen characters are dominant over to characters vestigeal wing and narrow abdomen. A pure breeding Drosophila having long wings and broad abdomen is crossed with a pure breeding vestigeal-winged and narrow-abdomened Drosophila. Two of the $F_1$ individuals were crossed and the following results were produced in the $F_2$ generation Long wing, broad abdomen in $482$ Drosophila. Vestigeal wing, narrow abdomen in $154$ Drosophila. Which one of the following is illustrated by these results

In a test cross involving $F_1$ dihybrid flies, more parental­type offspring were produced than the recombinant­type offspring. This indicates