Similar offsprings are produced to maintain the general body design....can u explain me in simple terms...

"Similar offsprings are produced to maintain the general body design"this sentence means that organisms, pass certain characteristics of themselves to the next generation through their genes, the special carriers of species specific traits. The genes parents pass along to their offspring are what make kids similar to others in their family, but they're also what make each child unique. These genes come from the father's sperm and the mother's egg, which are produced by the male and female reproductive systems.