metacentric


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Related to metacentric: metacenter, metacentric chromosome

metacentric

[¦med·ə′sen·trik]
(cell and molecular biology)
Having the centromere near the middle of the chromosome.
References in periodicals archive ?
Three forms of Bs were detected: a metacentric B chromosome (BT), morphologically similar to first chromosomal pair of the standard karyotype (Fig.
Presence or absence of metacentric chromosome -0,31 0,18 0,39 0,31 0,00 6.
The complement includes four larger pairs of metacentric, eight pairs of submetacentric, five pairs of subtelocentric (some of them represent the largest elements) and six acrocentric autosomal pairs which are the smallest elements.
For example, if the fusion event occurred in the most-recent common ancestor of the Cyprinodontina, the phylogenetic pattern would require three fission events (losses of the metacentric Y) as opposed to two fusions in the independent origins hypothesis.
As can be seen, karyotype analysis has revealed 2n=20 chromosomes in which five pairs were metacentric, three pairs submetacentric and the remaining two pairs were subacrocentric (Table 2 and Fig.
Nomenclature: B: ship breadth; d: ship draft; Fd: Froude number based on ship draft; Fn: Froude number based on ship length; g: gravitational acceleration; GM: metacentric height; k: wave number; L: ship length; Lpp: ship length between perpendiculars; P: pressure; Te: encounter wave period; TKM: transverse metacenter height; t: time; U: ship advance speed; @: wave direction angle; ?
A karyotype composed by 2n = 48 chromosomes with occurrence of metacentric and submetacentric chromosomes, as observed in Geophagus cf.
The acrocentric nature of the Y-chromosome establishes that the Vechur cattle belong to the species of the Zebu cattle (bus indicus) as different from the European cattle (bus taurus) which has metacentric y-chromosome.
All the autosomes are biarmed (8 metacentric, m; and 2 submetacentric pairs, sm), meanwhile the X and Y are acrocentrics (a).
Two cytotypes were found: cytotype C1, 2n=46, composed of 6 medium size metacentrics, 2 subtelocentrics and 38 acrocentrics; and cytotype C2, 2n=45, composed of one large metacentric plus 5 medium size metacentries, 1 subtelocentric and 38 aerocentric chromosomes.
Besides the chromosomal group above-described, two brother animals, from one of the analyzed Institution, evidenced a metacentric Y chromosome (Figure 1b), although it had been the smallest element of the karyotype complement.
Darlington's first relevant contributions to the study of meiosis and chiasmata (before he turned almost exclusively to plants) were performed in gomphocerine grasshopper species (Chorthippus, Stauroderus), an extremely good material for cytogenetic work on male meiosis, because species of this group of genera (the 'truxaline' grasshoppers) not only have beautiful large-sized chromosomes, but also an asymmetric karyotype involving three metacentric homologous pairs of autosomes and five telocentric ones, allowing direct simultaneous comparisons of pairing and chiasma formation in both types of configurations (Darlington 1935, 1936, 1937; Darlington & Dark 1932).