| dc.description.abstract | The research of " Karyotype Differences of Two Species of Batak fish (Tor
Neolissochilus sp. and Tor sp.)" has conducted from March to September 2009 at
Genetics’ Laboratory of Mathematics and Natural Sciences Faculty, University of
Sumatera Utara, Medan. Analysis carried out on the gills of two species of fish by
using a method developed by Fisher and Rachlin (1972) with Giemsa staining. The
results of this study showed karyotype differences from Neolissochilus sp. and Tor sp.
Neolissochilus sp. and Tor sp. has 3 types of chromosomes with chromosome type
metacentric, submetacentric and telocentric. The longest chromosome of
Neolissochilus sp. is t he c hromosome numb er 1 with a leng th o f 0 .7 5 μm w ith
chromosome type submetacentric while, the longest chromosome of Tor sp is
chromosome number 1 with length 0.87 μm with metacentric type. The shortest
chromosome of Neolissochilus sp. is the chromosome number 40 with a length of 0.04
μm with chromosome type telosentric. While the shortest chromosome of Tor sp. is
chromosome number 27 with length 0.09 μm with chromosome type telocentric. The
biggest chromosome arm relative Percentage (% PR) of Neolissochilus sp. is 7.2 %
while, Tor sp. is 7.85 %. The smallest chromosome arm relative percentage of
Neolissochilus sp. is 0.3 % while Tor sp. 0.75 %. The biggest percentage centromere
index (% IS) of Neolissochilus sp. and Tor sp. has same value (100%). The smallest
percentage centromere index of Neolissochilus sp. is 25 %, while Tor sp. is 28 %. | en_US |
