Genetics

Genetics is the study of genes. The word genetics means ‘give birth’ in it’s original Greek. Genetics is also the study of heredity and the variation of organisms. The word genetics was first mentioned to describe the study of inheritance and the science of variation by the British scientist William Bateson in a personal letter that had been written to Adam Sedgwick and was dated April 18, 1905. William Bateson first employed the word genetics publicly at the Third International Conference on Genetics in 1906, in London, England.

People applied knowledge of genetics in prehistory with the breeding and domestication of animals and plants. In modern research, genetics offers important tools for the investigation of the function of a particular gene. For example, the analysis of genetic interactions. Inside organisms, genetic information generally is carried in chromosomes where it is represented in the chemical structure of particular DNA molecules.

Genes encode the information that is necessary for the synthesis of amino-acid sequences in proteins, which itself plays a huge part in determining the final phenotype of the organism. In diploid organisms, a dominant allele on one chromosome will tend to mask the expression of a recessive gene on the other chromosome.

The genetic phrase ‘to code for’ is frequently used to mean that a gene contains the instructions on how to build a certain protein, as in ‘the gene codes for the protein’. As an example, a single gene may produce multple results, depending on how its transcription is regulated. Genes code for the nucleotide sequences in tRNA, mRNA and rRNA, which are required for protein synthesis.

Genetics decides many of the factors of appearance of organisms, including humans, and usually provide some idea as to how they might act. A clone resulting from the early split of an embryo are known as Monozygotic twins. These twins have the same DNA, yet completely unique personalities and identities.

Classical genetics is made up of the methodologies and techniques of genetics that predate the introduction of molecular biology. After the discovery of the genetic code and tools of cloning as restriction enzymes, the pathways of investigation open to geneticists were greatly widened. Some classical genetic ideas have been supplanted with the mechanistic understanding brought about by molecular discoveries. Yet many remain quite intact and still in use, like Mendel’s laws. Behavioral geneticists study the relationship between genes and behavior.

In clinical genetics, physicians who are trained as geneticists treat, diagnose, and counsel patients that have genetic disorders or syndromes. These geneticist doctors are generally trained in a genetics residency or fellowship.

Molecular genetics adds to the foundation of classical genetics yet focuses attention on the function and structure of genes at a molecular level. Molecular genetics employs the methods of molecular biology and classical genetics. An important part of molecular genetics is the utilization of molecular information to determine the patterns of descent, and soothe most accurate scientific classification of organisms is called molecular systematic.

Quantitative, population and ecological genetics are all very closely connected to subfields and build upon classical genetics. These are mainly distinguished by a common theme of studying populations of organisms drawn from the wild but differ a little in the choice of which characteristic of the organism on which is focused.

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