Define the following terms: Sticky ends and Transgene.

(N/A) $(1)$ Sticky ends: These are single-stranded extensions of a $DNA$ fragment that have been cleaved at a specific sequence,often by a restriction endonuclease,in a staggered cut. These extensions are complementary to those of similarly cleaved $DNAs$,allowing them to base-pair with each other.
$(2)$ Transgene: $A$ gene that is isolated from one organism and inserted into the genome of another organism,such that it is replicated as part of the host genome and is present in all the recipient's cells. The resulting organism is described as transgenic.