CHROMOSOMES OF AMERICAN MARSUPIALS.
Studies of the chromosomes of four American marsupials demonstrated that Caluromys derbianus and Marmosa mexicana have a diploid number of 14 chromosomes, and that Philander opossum and Didelphis marsupialis have a diploid number of 22. The karyotypes of C. derbianus and M. mexicana are similar, whereas those of P. opossum and D. marsupialis are dissimilar. If the 14-chromosome karyotype represents a reduction from a primitive number of 22, these observations suggest that the change has occurred independently in the American and Australasian forms.
D000818:Animals; D002875:Chromosomes; D004171:Diploidy; D005823:Genetics; D007620:Karyometry; D059785:Karyotype; D007621:Karyotyping; D008394:Marsupialia; D009893:Opossums; D012106:Research; D012723:Sex; D046509:Tissue Culture Techniques; D014481:United States
CHROMOSOMES; EXPERIMENTAL LAB STUDY; GENETICS; KARYOMETRY; MARSUPIALIA; SEX; TISSUE CULTURE