The right answers are Genetic engineering and gene.
Genetic engineering is a process of changing the genetic make-up of an organism by removing or introducing DNA.
Genetic engineering, which leads to genetic transformations on DNA, is based on a set of cellular and molecular tools including the cloning of a gene.
It is often aimed at modifying genotypes, and therefore phenotypes.
Well it happens every six months, one in summer in June and winter December. And if i'm wrong then i understand :) <span />
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My answer: i want to make it more clear in stead just words so here it is...........hope you understand the explantion... follow up if you need more info....