Allatum hormone see juvenile hormone

Allee's principle The concept of an optimal population level where organisms flourish.

allele n. [Gr. allelon, one another] Genes occupying the same locus in homologous chromosomes, that segregate from each other at the reduction division. see dominant allele, pseudoallele, isoallele, recessive allele, multiple al-lele.

allelism n. [Gr. allelon, one another] The relationship between two characters that are alleles; alleomorphism; alternative inheritance.

allelochemic, allelochemical n. [Gr. allelon, one another; chemeia, pert. chemistry and chemical terms] 1. A chemical agent of natural origin involved in interaction between species or individuals; sometimes divided into four subgroups based on whether the emitter, the receiver, or both benefit in the interaction: allomones, kairomones, syno-mones and apneumones. 2. Xenomone.

allelomimetic a. [Gr. allelon, one another; mimikos, imitative] Referring to imitation of behavioral habits of another animal, usually of the same species.

allelomorph n. [Gr. allelon, one another; morphe, form] 1. Two contrasting, although closely parallel genetic characters. 2. A member of a Mendelian pair.

allelopathy n. [Gr. allelon, one another; pathos, suffer] The chemical effect of plants on other organisms in the environment.

allelotropism n. [Gr. allelon, one another; tropein, to turn] The mutual attraction between two cells or organisms.

allelotype n. [Gr. allelon, one another; typos, type] The repeated occurrence of alleles in a given population.

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