fundamental number


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fundamental number

[¦fən·də¦men·təl ′nəm·bər]
(genetics)
The number of chromosome arms of a karyotype.
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References in periodicals archive ?
In this proposal, we outline three lines of research concerning fundamental number theoretical problems that have baffled mathematicians for decades.
It was found that the diploid number (2n), the fundamental number (NF) and the number of autosomal arms (NFa) were 54, 56 and 52, respectively.
LeGrande (1981) proposed a hypothetical ancestral karyotype for Siluriformes with 2n=56 [+ or -] 2 and high Fundamental Number (NF), which was supported by other studies in different species of the order (Oliveira and Gosztonyi, 2000).
The karyotype of the northern population specimen from Itapaje (MN 67469), had a diploid number (2n) of 52 and a fundamental number (FN) of 92, and was comprised of 21 pairs of metacentric/submetacentric chromosomes, and four pairs of acrocentrics.
In such cases, fundamental number may be a more biologically relevant measure of variance than diploid number.
Furthermore, karyotypes of certain species show geographical variation in the fundamental number of chromosomes as well as the diploid number of chromosomes as in the Genera Nannospalax and Meriones (5-7).
Fundamental number theory with applications, 2d ed.
With a karyotype formula of 46M/SM + 12ST, the fundamental number (FN) was 116; there were no differences between the two populations.
1) presented a diploid number (2n) equal to 32 chromosomes with a fundamental number (FN) of 46 chromosomic arms (Duarte, 1992).

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