Heredity in the context of "Gene"

Biology is the scientific study of life and living organisms. It is a broad natural science that encompasses a wide range of fields and unifying principles that explain the structure, function, growth, origin, evolution, and distribution of life. Central to biology are five fundamental themes: the cell as the basic unit of life, genes and heredity as the basis of inheritance, evolution as the driver of biological diversity, energy transformation for sustaining life processes, and the maintenance of internal stability (homeostasis).

Biology examines life across multiple levels of organization, from molecules and cells to organisms, populations, and ecosystems. Subdisciplines include molecular biology, physiology, ecology, evolutionary biology, developmental biology, and systematics, among others. Each of these fields applies a range of methods to investigate biological phenomena, including observation, experimentation, and mathematical modeling. Modern biology is grounded in the theory of evolution by natural selection, first articulated by Charles Darwin, and in the molecular understanding of genes encoded in DNA. The discovery of the structure of DNA and advances in molecular genetics have transformed many areas of biology, leading to applications in medicine, agriculture, biotechnology, and environmental science.

Johan August Strindberg (/ˈstrɪn(d)bɜːrɡ/; Swedish: [ˈǒːɡɵst ˈstrɪ̂nːdbærj] ; 22 January 1849 – 14 May 1912) was a Swedish playwright, novelist, poet, essayist, and painter. A prolific writer who often drew directly on his personal experience, Strindberg wrote more than 60 plays and more than 30 works of fiction, autobiography, history, cultural analysis, and politics during his career, which spanned four decades. A bold experimenter and iconoclast throughout his life, he explored a wide range of dramatic methods and purposes, from naturalistic tragedy, monodrama, and historical plays to his anticipations of expressionist and surrealist dramatic techniques. From his earliest work, Strindberg developed innovative forms of dramatic action, language, and visual composition. He is considered the "father" of modern Swedish literature and his The Red Room (1879) has frequently been described as the first modern Swedish novel. In Sweden, Strindberg is known as an essayist, painter, poet, and especially novelist and playwright, but in other countries he is known mostly as a playwright.

The Royal Theatre rejected his first major play, Master Olof, in 1872; it was not until 1881, when he was thirty-two, that its première at the New Theatre gave him his theatrical breakthrough. In his plays The Father (1887), Miss Julie (1888), and Creditors (1889), he created naturalistic dramas that – building on the established accomplishments of Henrik Ibsen's prose problem plays while rejecting their use of the structure of the well-made play – responded to the call-to-arms of Émile Zola's manifesto "Naturalism in the Theatre" (1881) and the example set by André Antoine's newly established Théâtre Libre (opened 1887). In Miss Julie, characterisation replaces plot as the predominant dramatic element (in contrast to melodrama and the well-made play) and the determining role of heredity and the environment on the "vacillating, disintegrated" characters is emphasized. Strindberg modeled his short-lived Scandinavian Experimental Theatre (1889) in Copenhagen on Antoine's theatre and he explored the theory of Naturalism in his essays "On Psychic Murder" (1887), "On Modern Drama and the Modern Theatre" (1889), and a preface to Miss Julie, the last of which is probably the best-known statement of the principles of the theatrical movement.

Evolution is the change in the heritable characteristics of biological populations over successive generations. It occurs when evolutionary processes such as genetic drift and natural selection act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. The process of evolution has given rise to biodiversity at every level of biological organisation.

The scientific theory of evolution by natural selection was conceived independently by two British naturalists, Charles Darwin and Alfred Russel Wallace, in the mid-19th century as an explanation for why organisms are adapted to their physical and biological environments. The theory was first set out in detail in Darwin's book On the Origin of Species. Evolution by natural selection is established by observable facts about living organisms: (1) more offspring are often produced than can possibly survive; (2) traits vary among individuals with respect to their morphology, physiology, and behaviour; (3) different traits confer different rates of survival and reproduction (differential fitness); and (4) traits can be passed from generation to generation (heritability of fitness). In successive generations, members of a population are therefore more likely to be replaced by the offspring of parents with favourable characteristics for that environment.

Natural selection is the differential survival and reproduction of individuals due to differences in the relative fitness endowed on them by their own particular complement of observable characteristics. It is a key law or mechanism of evolution which changes the heritable traits characteristic of a population or species over generations. Charles Darwin popularised the term "natural selection", contrasting it with artificial selection, which is intentional, whereas natural selection is not.

For Darwin natural selection was a law or principle which resulted from three different kinds of process: inheritance, including the transmission of heritable material from parent to offspring and its development (ontogeny) in the offspring; variation, which partly resulted from an organism's own agency (see phenotype; Baldwin effect); and the struggle for existence, which included both competition between organisms and cooperation or 'mutual aid' (particularly in 'social' plants and social animals).

This page gives a list of domesticated animals, also including a list of animals which are or may be currently undergoing the process of domestication and animals that have an extensive relationship with humans beyond simple predation. This includes species which are semi-domesticated, undomesticated but captive-bred on a commercial scale, or commonly wild-caught, at least occasionally captive-bred, and tameable. In order to be considered fully domesticated, most species have undergone significant genetic, behavioural and morphological changes from their wild ancestors, while others have changed very little from their wild ancestors despite hundreds or thousands of years of potential selective breeding. A number of factors determine how quickly any changes may occur in a species, but there is not always a desire to improve a species from its wild form. Domestication is a gradual process, so there is no precise moment in the history of a given species when it can be considered to have become fully domesticated.

Zooarchaeology has identified three classes of animal domesticates:

Behaviorism is a systematic approach to understanding the behavior of humans and other animals. It assumes that behavior is either a reflex elicited by the pairing of certain antecedent stimuli in the environment, or a consequence of that individual's history, including especially reinforcement and punishment contingencies, together with the individual's current motivational state and controlling stimuli. Although behaviorists generally accept the important role of heredity in determining behavior, deriving from Skinner's two levels of selection (phylogeny and ontogeny), they focus primarily on environmental events. The cognitive revolution of the late 20th century largely replaced behaviorism as an explanatory theory with cognitive psychology, which unlike behaviorism views internal mental states as explanations for observable behavior.

Behaviorism emerged in the early 1900s as a reaction to depth psychology and other traditional forms of psychology, which often had difficulty making predictions that could be tested experimentally. It was derived from earlier research in the late nineteenth century, such as when Edward Thorndike pioneered the law of effect, a procedure that involved the use of consequences to strengthen or weaken behavior.