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Population structure (also called genetic structure and population stratification) is the presence of a systematic difference in allele frequencies between subpopulations.In a randomly mating (or panmictic) population, allele frequencies are expected to be roughly similar between groups.
This glossary of biology terms is a list of definitions of fundamental terms and concepts used in biology, the study of life and of living organisms.It is intended as introductory material for novices; for more specific and technical definitions from sub-disciplines and related fields, see Glossary of cell biology, Glossary of genetics, Glossary of evolutionary biology, Glossary of ecology ...
Graphic breakdown of stratified random sampling. In statistics, stratified randomization is a method of sampling which first stratifies the whole study population into subgroups with same attributes or characteristics, known as strata, then followed by simple random sampling from the stratified groups, where each element within the same subgroup are selected unbiasedly during any stage of the ...
Proportionate allocation uses a sampling fraction in each of the strata that are proportional to that of the total population. For instance, if the population consists of n total individuals, m of which are male and f female (and where m + f = n), then the relative size of the two samples (x 1 = m/n males, x 2 = f/n females) should reflect this proportion.
The hypolimnion or under lake is the dense, bottom layer of water in a thermally-stratified lake. [1] The word "hypolimnion" is derived from Ancient Greek: λιμνίον, romanized: limníon, lit. 'lake'. [2] It is the layer that lies below the thermocline.
The epilimnion or surface layer is the top-most layer in a thermally stratified lake.. The epilimnion is the layer that is most affected by sunlight, its thermal energy heating the surface, thereby making it warmer and less dense.
Download as PDF; Printable version; In other projects Wikidata item; ... Glossary of invasion biology terms; L. List of Latin and Greek words commonly used in ...
A blotting method in molecular biology used to detect RNA in a sample. Compare Southern blotting, western blotting, and eastern blotting. nRNA See nuclear RNA. N-terminus. Also amine terminus and amino terminus. The end of a linear chain of amino acids (i.e. a peptide) that is terminated by the free amine group (–NH