53 results found

Search Results for: natural mutation

Missense mutation

What is a missense mutation? Literally speaking, a mutation that changes the meaning of the encoded gene sequence is the... Read More

Nonsense mutation

A nonsense mutation is the type of point mutation that renders the translation process useless by coding for a stop/nonsense... Read More

Natural mutation

natural mutation --> spontaneous mutation A mutation which occurs by itself without first being affected by a mutagen,... Read More

Natural selection

Natural Selection Definition What is natural selection in biology? Natural selection is defined as a process in nature... Read More

Neutral mutation

Neutral Mutation Definition What is a neutral mutation? Neutral mutations are the alterations in the DNA that are... Read More

Mutagen

Mutagen Definition What is a mutagen? A mutagen is a substance or agent that causes DNA impairment that results in the... Read More

Genetic drift

Genetic Drift Definition What is genetic drift in simple terms? The simple definition of genetic drift ( also referred to... Read More

Epistasis

Epistasis Definition What is epistasis in genetics? How does epistasis occur? The epistasis definition, in biology, refers... Read More

Pleiotropy

Pleiotropy Definition When one single gene starts affecting multiple traits of living organisms, this phenomenon is known... Read More

Genetic variability

Genetic Variability Definition Genetic variability refers to the tendency of individual genetic characteristics in a... Read More

Genetic diversity

Genetic Diversity Definition Each species is composed of individuals with their own set of genes. A gene is the inheritance... Read More

Darwinian fitness

Darwinian Fitness Definition Darwinian fitness refers to the measure of an individual organism's or genotype's reproductive... Read More

Evolution

Evolution Definition Evolution is defined as a change in the genetic composition of a population over successive... Read More

Polymorphism

Polymorphism Definition The occurrence of two or more different forms or morphs in the population of a species is referred... Read More

Examples of Natural Selection

Reviewed by: Mary Anne Clark, Ph.D. Darwin's Finches Darwin's finches are an excellent example of the way in... Read More

Genetics – Lesson Outline & Worksheets

  Topics Modules Quizzes/Worksheets Description Introduction to Genetics Genetics - Definition:... Read More

A Look Into Natural Selection and its Mechanisms

Charles Darwin is credited with outlining the fundamentals of evolution. He was a smart and eager pupil and protégé, and... Read More

Chimera

When we learned about the basic genetics of biological life, we came to know that almost all the cells of an individual have... Read More

Disruptive Selection

An evolutionary process known as disruptive selection (or disruptive natural selection) causes a population to become... Read More

Isoenzyme

Isozymes (also known as isoenzymes) are enzymes that differ in amino acid sequence but catalyze the same chemical reaction.... Read More

Polyploidy

Reviewed by: Mary Anne Clark, Ph.D. Polyploidy Polyploidy is defined as the state of being polyploid, which... Read More

Sympatric speciation

Speciation is a process of evolution through which two different existing populations evolve and a distinct species form. It... Read More

The Gene Pool and Population Genetics

Reviewed by: Mary Anne Clark, Ph.D. The previous tutorial is about adaptive radiation. Adaptive radiation is... Read More

Genetic variation

Definition noun, plural: genetic variations Variations of genomes between members of species, or between groups of species... Read More

Cancer

Cancer Definition In biology, cancer is defined as the malignant growth due to uncontrolled cell division. It is now used... Read More

Chromosomal crossover

Chromosomal Crossover Definition noun A process occurring during meiosis wherein homologous chromosomes pair up and... Read More

Gene

A gene is the fundamental, physical, and functional unit of heredity. The genes make up the sequences of DNA (genotypes).... Read More

Biology

Biology Definition Biology is the branch of science that primarily deals with the structure, function, growth, evolution,... Read More

Nucleic acid

Nucleic Acid Definition A nucleic acid refers to any of the group of complex compounds consisting of chains of monomers of... Read More

Deoxyribonucleic acid

Deoxyribonucleic Acid (DNA) Definition A nucleic acid refers to any of the group of complex compounds made up of linear... Read More

The Evolutionary Development of Multicellular Organisms

The beginning of the Cambrian era saw a widespread arrival of multi-cellular organisms, particularly in the form of sponges.... Read More

Degenerate

Degenerate means to become worse or less of its kind or former state. In biology, it means an entity performs the same... Read More

Degenerative disease

Degenerative Disease Definition A degenerative disease is defined as a disease characterized by the worsening condition due... Read More

Asexual reproduction

Asexual Reproduction Definition What is asexual reproduction? Asexual reproduction is a type of reproduction that does not... Read More

Equilibrium

Equilibrium Definition In Biology Equilibrium refers to the state of balance and stability. In biology, equilibrium is... Read More

Chronobiology

Chronobiology Definition Chronobiology is a branch of biology that studies time-related phenomena (e.g., biological... Read More

Inbreeding

Inbreeding is a type of breeding or mating where closely related individuals with a common ancestor produce progenies with... Read More

Hot spot

Definition noun, plural: hot spots (1) (pathology) A superficial weeping skin lesion such as in dogs and cats caused by an... Read More

Primitive Animals

Incorrect taxonomic classifications deemed organisms to be either animals or plants, in the Plantae or Animalia kingdoms... Read More

Trehalose

Definition noun plural: trehaloses tre·ha·lose, loʊs A disaccharide made up of two α-glucose molecules, and serves as... Read More