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rule in Biological Definition

Charles Darwin

... Social Darwinism , a term that first appeared in about 1900 , where the rule of the strong is justified by claims that it merely reproduces in society Nature's rule that the fittest survive. Whether Darwin was a "Social Darwinist" is an ...

Alcohol

... of diethyl ether . More useful is the E1 elimination reaction of alcohols to produce alkenes . The reaction generally obeys Zaitsev's rule , which states that the most stable (usually the most substituted) alkene is formed. Tertiary alcohols eliminate easily at just above room ...

Morphogenesis

... (abdomen) Dorso - ventral Terminal (special structures at the unsegmented ends of the embryo) Additional segmentation genes Pair rule Two additional classes of segmentation genes are expressed after the gap gene products. The pair-rule genes are expressed in striped patterns ...

Warm-blooded

... or sweating (to increase heat loss through evaporation ). Warm-blooded versus cold-blooded Biochemical processes are heat dependent. The rule of thumb is that they go faster when they are warm and slower when they are cold. The advantage of being warm blooded is that you can always maintain ...

Enhancer

... a gene-cluster. An enhancer does not need to be particularly close to the genes it acts on, but it is on the same chromosome. (An exception to this rule was published in a 1990 article in Science , where researchers Wedel, et. al., made two linked circles of DNA, one circle with the enhancer sequence ...

Evolutionary biology

... in evolutionary biology . Category:Notable publications in evolutionary biology Topics in evolutionary biology Foster's rule ...

Modern evolutionary synthesis

... et al . Wallace rejected the Lamarckian idea of inheritance of acquired characteristics, something that Darwin, Huxley et al wouldn't rule out. The mechanism of inheritance wasn't discovered in Darwin or Wallace's time, however, so the debate was never settled. Mendelian genetics ...

Morphogenesis

... (abdomen) Dorso - ventral Terminal (special structures at the unsegmented ends of the embryo) Additional segmentation genes Pair rule Two additional classes of segmentation genes are expressed after the gap gene products. The pair-rule genes are expressed in striped patterns ...

Natural selection

... form of natural selection could occur in the non-biological realm (see, for example, Genetic programming ). Note also that this formulation does not rule out selection occurring at all biological levels (e.g. gene, organism, group). Finally, note that the particular process of introducing new traits ...

Peripheral membrane protein

... in contrast to integral membrane proteins, tend to collect in the water-soluble fraction during protein purification . An exception to this rule is that cells may attach an "anchor" moiety, such as the fatty-acid anchor of lipid anchored proteins , which makes the purification properties of ...

Species

... to delineate a separate species, provided only that the difference is clear and consistent (and that other criteria are met). There is no universal rule to state the smallest allowable difference between two species, but in general, very trivial differences are ignored on the twin grounds of simple ...
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