Genetic variation makes individuals within a species different. fertilization results in each offspring having a copy of each gene from each parent so offspring resemble their parents. however, certain events result in offspring being genetically diverse from their parents. consider the table above. it gives the results for the eye color gene. which statement correctly describes the results of the crossing of a wild type male with a white eyed female. a) an error occurred during replication causing a brown eyed female offspring b) a mutation in the female's dna occurred during mitosis causing a brown eyed female offspring c) environmental factors caused a mutation during meiosis creating a brown eyed female offspring d) a new genetic combination was made due to crossing over during meiosis creating a brown eyed female offspring

Genetics is a branch of biology concerned with the study of genes, genetic variation, and heredity in living organisms.[1][2][3]

The discoverer of genetics is Gregor Mendel, a late 19th-century scientist and Augustinian friar. Mendel studied "trait inheritance", patterns in the way traits are handed down from parents to offspring. He observed that organisms (pea plants) inherit traits by way of discrete "units of inheritance". This term, still used today, is a somewhat ambiguous definition of what is referred to as a gene.

Trait inheritance and molecular inheritance mechanisms of genes are still primary principles of genetics in the 21st century, but modern genetics has expanded beyond inheritance to studying the function and behavior of genes. Gene structure and function, variation, and distribution are studied within the context of the cell, the organism (e.g. dominance), and within the context of a population. Genetics has given rise to a number of subfields, including epigenetics and population genetics. Organisms studied within the broad field span the domains of life (archaea, bacteria, and eukarya).

Genetic processes work in combination with an organism's environment and experiences to influence development and behavior, often referred to as nature versus nurture. The intracellular or extracellular environment of a cell or organism may switch gene transcription on or off. A classic example is two seeds of genetically identical corn, one placed in a temperate climate and one in an arid climate. While the average height of the two corn stalks may be genetically determined to be equal, the one in the arid climate only grows to half the height of the one in the temperate climate due to lack of water and nutrients in its environment.

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