Genetics Genetics Plant and animal tissues are composed of cells. These cells have an outer membrane, cytoplasm, and nucleus. The chromosomes are contained in pairs, and each chromosome has genes.
Genes are the functional components of inheritance.
When cells divide to produce more body cells, the chromosomes replicate as well by a process called mitosis . Each species has a characteristic number of chromosomes. The production of sex cells, occurs in the testicle or ovary. The cell division is accomplished through meiosis . Each newly formed gamete contains only one of the original chromosome pairs.