DNA is the chemical of heredity and is found in the chromosomes of our cells. The instructions of the DNA are used to synthesize various proteins needed by the body to function optimally. Distinct segments of DNA are known as genes. Genes are inherited by offspring from their parents. In sexually reproducing organisms, fifty percent of the genes come from the mother and fifty percent from the father. Meiotic cell division produces haploid gametes or sex cells, with half the chromosomes the organism will need. At fertilization, the two haploid sex cells form a diploid zygote(fertilized egg). It is at that moment, that all of the organism's genes are established that they will have in their body. From that fertilized egg, mitotic divisions take place until a mature offspring is formed. All the cells of the body have the chromosome complement that was present in that first fertilized egg cell. In asexually reproducing organisms, whatever chromosomes the parent cell has are passed down to the offspring due to mitosis.