272 results found

Search Results for: population

Population

Living organisms typically prefer to live, grow and survive in groups. Except for some species that prefer solitude - both... Read More

Population Growth and Survivorship

By: Maria Victoria Gonzaga Previously, we learned about biodiversity and endemism. Now, let's look at the... Read More

Population Regulation in an Ecosystem

Darwin focused some of this work in regards to the population size of a species, and what factors may affect them. He... Read More

Density dependent factor

Density-dependent factors are the limiting factors of an ecosystem that regulate population growth in a density-dependent... 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

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

Carrying capacity

Carrying Capacity Definition What is carrying capacity? In biology and environmental science, the carrying capacity of 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

Limiting factor

Limiting Factor Definition A limiting factor refers to any of the factors (variables) in an environment capable of limiting... Read More

Fecundity

Fecundity Definition The meaning of fecundity is the reproductive rate (fecundity rate) or the performance of an individual... Read More

Natural selection

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

Allopatric speciation

We can define speciation as a process by which the novel genetically independent group of organisms are formed through the... 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

Predation

In ecology, predation is a mechanism of population control. Thus, when the number of predators is scarce the number of... Read More

Prevalent

Prevalent Definition We can define "prevalent" as the most commonly found, being dominant or widespread, or describing the... Read More

Disruptive Selection

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

Population pyramid

population pyramid (Science: epidemiology) graphical representation of the age and sex composition of a population,... Read More

Biotic potential

When we look at the different forms of life, we often wonder how they have continued to exist one generation after another.... 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

Interspecific competition

Interspecific Competition Definition In Biology, competition is defined as the process that occurs among species that have... Read More

Apparent competition

Competition Definition One of the many branches of biology is ecology. Ecology is the study of the relationships that the... Read More

Environmental resistance

Environmental Resistance Definition Environmental resistance is such a process in which certain different elements or... Read More

Viability

Whether we talk about “a travel plan” or “a science experiment” or “the chances of a pregnancy reaching its... Read More

Null hypothesis

Null Hypothesis Definition Null hypothesis is defined as “the commonly accepted fact (such as the sky is blue) and... Read More

Neutral mutation

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

Density dependence

Definition noun (population ecology) An effect in which the intensity changes with the increasing population density, e.g.... Read More

Population density

population density (Science: epidemiology) number of individuals in a population relative to... Read More

Gene flow

Definition noun The movement and exchange of genes or alleles from one population of species to another Supplement Gene flow... Read More

Homogenous

What is homogenous? What does homogenous mean? The word homogenous has been derived from two Greek words that are... Read More

Population genetics

Population genetics (Science: epidemiology, genetics) The study of genetic influences on the components of cause and effect... Read More

Gene pool

Definition noun, plural: gene pools (population genetics) The total number of genes of every individual in an interbreeding... Read More

Population characteristics

population characteristics (Science: epidemiology) Qualities and characterization of various types of populations within a... Read More

Polygenic inheritance

Polygenic inheritance refers to the kind of inheritance in which the trait is produced from the cumulative effects of many... Read More

Takahē (Porphyrio hochstetteri)

By: Maria Victoria Gonzaga Previously, we've seen the different animals endemic to New Zealand. Due to the... Read More

Evolution

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

Biosphere

What is biosphere? The biosphere is that part of the Earth where living things thrive and live. It is the portion of the... Read More

Mātauranga Māori and Science

By: Maria Victoria Gonzaga In the previous lesson, we learned about the various methods used in measuring... Read More

Organization

Organization Definition The meaning of the term "organization" is very simple. It means the state wherein things are... Read More

Allele frequency

Definition noun, plural: allele frequencies The frequency of an allele relative to that of other alleles of the same gene in... Read More

Biosecurity and Biocontrol

By: Maria Victoria Gonzaga In the previous lesson, we learned about the importance of modern science... Read More