PLAY. The population that occupies a very small area, is smaller in size, such a population is called local population. The level beyond which no major increase can occur is referred to as saturation level or carrying capacity (K). As with any biological population, the size of a human population is limited by the supply of food, the effect of diseases, and other environmental factors. Megan_Larkin. Human populations grow and shrink due the balance between births and deaths. Population growth rate = birth rate – death rate . Flashcards. Gravity. environment - all the conditions that surround a living organism Population biology is a subset study within ecology that evaluates factors that affect populations. This separates the original population into two, which are now unable to reproduce due to the geographical barrier. Learn. Definition of Population 2. Within a single community, one population is affected by other populations, the biotic factors, in its environment. In the last phase the new organisms are almost equal to the number of dying individuals and thus there is no more increase in population size. the study of the relationships between organisms and their environment. The definition of population ecology is the study of how various factors affect population growth, rates of survival and reproduction, and risk of extinction. Terms in this set (32) Ecology. Population Attributes 3. A population could become geographically isolated over time by new mountain ranges or new bodies of water separating land masses for example. A population is defined as a group of the same species living in a similar geographical area. Populations within communities are also affected by, and in turn affect, the abiotic (physicochemical) factors in an ecosystem. Test. A level Biology - Populations and Ecosystems. The number of births per 1000 people is called the birth rate, and the number of deaths per 1000 people is the death rate. The S-shaped sigmoid growth form is represented by the following equation: Allele Frequency The allele frequency (or gene frequency) is the rate at which a specific allele appears within a population. Population is a widely used term in many disciplines to refer a closely associated group of one kind. Definitions. Population genetics is the study of how selective forces change a population through changes in allele and genotypic frequencies. A population's ability to increase at its maximum rate under optimal conditions is called its biotic potential. Match. In biology, a population is a number of all the organisms of the same group or species who live in a particular geographical area and are capable of interbreeding. The area of a sexual population is the area where inter-breeding is possible between any pair within the area and more probable than cross-breeding with individuals from other areas.. Write. STUDY. a non living feature of … It’s really not a complicated equation, you must admit. Created by. Within all populations there is genetic variation due to random mutations. Populations change over time due to births, deaths, and the dispersal of individuals between separate populations. The following common terms can be used to describe living things in their environment: . The Population Growth Rate. Population. Definition of Population: Population is a set of individuals of a particular species, which are found in a particular geographical area. 3.7.1 Inheritance (A-level only) Population, in human biology, the whole number of inhabitants occupying an area (such as a country or the world) and continually being modified by increases (births and immigrations) and losses (deaths and emigrations). When resources are plentiful and environmental conditions appropriate, populations can increase rapidly. The biological definition for the term population is a group of individuals of the same species living in the same place at a certain time. In population biology, the term population refers to a group of members of a species living in the same area.