Open AccessThe chromosomes of the Cynomolgus macaque ( Macaca fascicularis )
Author(s) -
FERNANDEZDONOSO R.,
LINDSTEN J.,
NORRBY E.
Publication year - 1970
Publication title -
hereditas
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 50
eISSN - 1601-5223
pISSN - 0018-0661
DOI - 10.1111/j.1601-5223.1970.tb02325.x
Subject(s) - biology , secondary constriction , chiasma , bivalent (engine) , x chromosome , somatic cell , genetics , centromere , autosome , macaque , chromosome , metaphase , gene , paleontology , chemistry , organic chemistry , metal
The Cynomolgus or crab‐eating macaque, Macaca fascicularis ( M. irus ) has 42 chromosomes. The X chromosome is submetacentric and about 5 % in length of the complement. One of the X chromosomes is very late replicating in the female somatic cells. The other X is also relatively late replicating. The Y chromosome is a minute acrocentric. A short metacentric chromosome was also found to be late replicating. Chromosome no. 20 has an obvious secondary constriction which often associates in a characteristic way. The sex bivalent is identified at pachytene as a characteristic “sex vesicle”. At diakinesis it shows an end‐to‐end association. The mean number of chiasmata per cell was 40 at diakinesis‐first metaphase.