Intraspecific crosses resulting in the first occurrence of eight and nine B chromosomes in Prochilodus lineatus (Characiformes, Prochilodontidae).

Abstract:

:B chromosomes are supernumerary elements present in about 15% of eukaryotic species and are most frequently heterochromatic, behave parasitically, show a transmission rate higher than standard (A) chromosomes, and can provoke harmful effects on carriers. In the current work, Prochilodus lineatus individuals carrying eight and nine B chromosomes were obtained by induced crossing performed involving breeders with different B chromosome numbers in their cells. The high B chromosome numbers found in the offspring were recorded for the first time in this species. The use of cytogenetic techniques applied in the present study revealed that regardless of the increase in number of B chromosomes in the genome of these individuals, those elements did not presented active genes, and showed their normal heterochromatic characteristic.

journal_name

Genet Mol Biol

authors

Voltolin TA,Senhorini JA,Foresti F,Bortolozzi J,Porto-Foresti F

doi

10.1590/s1415-47572011005000009

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

220-4

issue

2

eissn

1415-4757

issn

1678-4685

journal_volume

34

pub_type

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