science

Reproduction  (or  procreation  or  breeding ) is the  biological process  by which new individual  organisms  – "offspring" – are produced from their "parents". Reproduction is a fundamental feature of all known  life ; each individual organism exists as the result of reproduction. There are two forms of reproduction:  asexual  and  sexual . In asexual reproduction, an organism can reproduce without the involvement of another organism. Asexual reproduction is not limited to  single-celled organisms . The  cloning  of an organism is a form of asexual reproduction. By asexual reproduction, an organism creates a genetically similar or identical copy of itself. The  evolution of sexual reproduction  is a major puzzle for biologists. The two-fold cost of sexual reproduction is that only 50% of organisms reproduce [1]  and organisms only pass on 50% of their  genes . [2] Sexual reproduction typically requires the sexual interaction of two specialized organisms, call

Inheritance (object-oriented programming)         In   object-oriented programming , inheritance is the concept that when a   class   of   object s is defined, any subclass that is defined can inherit the definitions of one or more general classes. This means for the programmer that an object in a subclass need not carry its own definition of data and methods that are generic to the class (or classes) of which it is a part. This not only speeds up program development; it also ensures an inherent validity to the defined subclass object (what works and is consistent about the class will also work for the subclass).                                                                                                                                                          In  object-oriented programming ,  inheritance  is when an  object  or  class  is based on another object ( prototypal inheritance ) or class ( class-based inheritance ), using the same implementation. Inheri

What is gene?                                                                                     A gene is the basic physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases. The   Human Geno      me Project   has estimated that humans have between 20,000 and 25,000 genes.                                                                                                                                                     Every person has two copies of each gene, one inherited from each parent. Most genes are the same in all people, but a small number of genes (less than 1 percent of the total) are slightly different between people. Alleles are forms of the same gene with small differences in their sequence of DNA bases. These small differences contribute to each person’s unique physical features. Genes are made up of DNA. Ea