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The pygmy mammoth is an example of insular dwarfism, a case of Foster's rule, its unusually small body size an adaptation to the limited resources of its island home.. A biological rule or biological law is a generalized law, principle, or rule of thumb formulated to describe patterns observed in living organisms.
Biological rules describe patterns of variation within and across species most often in regard to size. While they are described as rules there are often many ...
When the human embryo, for instance, is but a simple vesicle, it is an infusorian; when it has gained a liver, it is a mussel; with the appearance of the osseous system, it enters the class of fishes; and so forth, until it becomes a mammal and then a human being.
The physical background of the mixing rule is the fact that the heat energy of a substance is directly proportional to its mass and its absolute temperature. The proportionality factor is the specific heat capacity , which depends on the nature of the substance, but which was not described until some time after Richmann's discovery by Joseph ...
Biology is the scientific study of life. [1 ... Lipids are the only class of macromolecules that are not made up of polymers. ... populations contain a varied mix of ...
Haldane's rule A rule formulated by J.B.S. Haldane which states that if one sex of the hybrid offspring resulting from a cross between two incipient species is inviable or sterile, that sex is more likely to be the heterogametic sex (i.e. the one with two different sex chromosomes). [19] haplodiploidy
In most cases, the mixture consists of two main constituents. For an emulsion, these are immiscible fluids such as water and oil. For a foam, these are a solid and a fluid, or a liquid and a gas. On larger scales both constituents are present in any region of the mixture, and in a well-mixed mixture in the same or only slightly varying ...
Admixture mapping is a method of gene mapping that uses a population of mixed ancestry (an admixed population) to find the genetic loci that contribute to differences in diseases or other phenotypes found between the different ancestral populations.