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((navbox
| name      = Biological rules
| title     = [[Biological rules]]
| listclass = vlist
| image     = [[File:Bergmann's Rule.svg|160px|link=Bergmann's rule|alt=Bergmann's rule illustrated with a map and graph]]

| group1    = Rules
| list1     = 
* [[Allen's rule]] ((wrap|((small|Shorter appendages in colder climates))))
* [[Bateson's rule]] ((wrap|((small|Extra limbs mirror their neighbours))))
* [[Bergmann's rule]] ((wrap|((small|Larger bodies in colder climates))))
* [[Cope's rule]] ((wrap|((small|Bodies get larger over time))))
* [[Deep-sea gigantism]] ((wrap|((small|Larger bodies in deep-sea animals))))
* [[Dollo's law of irreversibility|Dollo's law]] ((wrap|((small|Loss of complex traits is irreversible))))
* [[Eichler's rule]] ((wrap|((small|Parasites co-vary with their hosts))))
* [[Emery's rule]] ((wrap|((small|Insect social parasites are often in same genus as their hosts))))
* [[Fahrenholz's rule]] ((wrap|((small|Host and parasite phylogenies become congruent))))
* [[Foster's rule]] ([[Insular gigantism]], [[Insular dwarfism]]) ((wrap|((small|Small species get larger, large species smaller, after colonizing islands))))
* [[Gause's law]] ((wrap|((small|Complete competitors cannot coexist))))
* [[Gloger's rule]] ((wrap|((small|Lighter coloration in colder, drier climates))))
* [[Haldane's rule]] ((wrap|((small|Hybrid sexes that are absent, rare, or sterile, are heterogamic))))
* [[Harrison's rule]] ((wrap|((small|Parasites co-vary in size with their hosts))))
* [[Kin selection|Hamilton's rule]] ((wrap|((small|Genes increase in frequency when relatedness of recipient to actor times benefit to recipient exceeds reproductive cost to actor))))
* [[Kleiber's law]] ((wrap|((small|An animals metabolic rate decreases with its size))))
* [[Willi Hennig|Hennig's progression rule]] ((wrap|((small|In cladistics, the most primitive species are found in earliest, central, part of group's area))))
* [[Jarman–Bell principle]] ((wrap|((small|The correlation between the size of an animal and its diet quality; larger animals can consume lower quality diet))))
* [[Jordan's rule]] ((wrap|((small|Inverse relationship between water temperature and no. of fin rays, vertebrae))))
* [[Lack's principle]]  ((wrap|((small|Birds lay only as many eggs as they can provide food for))))
* [[Rapoport's rule]] ((wrap|((small|Latitudinal range increases with latitude)))) 
* [[Rensch's rule]] ((wrap|((small|Sexual size dimorphism increases with size when males are larger, decreases with size when females are larger))))
* [[Rosa's rule]] ((wrap|((small|Groups evolve from character variation in primitive species to a fixed character state in advanced ones))))
* [[Ivan Schmalhausen|Schmalhausen's law]] ((wrap|((small|A population at limit of tolerance in one aspect is vulnerable to small differences in any other aspect))))
* [[Thorson's rule]] ((wrap|((small|No. of eggs of benthic marine invertebrates decreases with latitude))))
* [[Leigh Van Valen|Van Valen's law]] ((wrap|((small|Probability of extinction of a group is constant over time))))
* [[von Baer's laws (embryology)|von Baer's laws]] ((wrap|((small|Embryos start from a common form and develop into increasingly specialised forms))))
* [[Samuel Wendell Williston|Williston's law]] ((wrap|((small|Parts in an organism become reduced in number and specialized in function))))
| group2    = Related
| list2     =
* [[Countergradient variation]] ((small|Where genetics opposes environment as a factor))
* [[Gigantothermy]] ((small|Large ectothermic animals more easily maintain constant body temperature)) 
))<noinclude>

[[Category:Biology navigational boxes]]
</noinclude>

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