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Results for “Karyometry”

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PubMed1965

CHROMOSOME COMPLEMENT: DIFFERENCES BETWEEN EQUUS CABALLUS AND EQUUS PRZEWALSKII, POLIAKOFF.

The chromosome number of the domestic horse is 2n = 64; different races have the same complement. The chromosomes of two Przewalski's horses (at Catskill Game Farm, New York), presumably ancestral wild horses from Mongolia, are identical: 2n = 66, with more acrocentric and fewer metacentric elements than the chromosomes of the domestic horse. This apparent difference in karyotype may help resolve the questions of "purity" in the relatively few remaining Przewalski's horses. Moreover, these findings are of interest in relation to the apparent fertility of hybrids between these species.

Animals↗
PubMed1965

MOSQUITO TRANSMISSION OF A RETICULUM CELL SARCOMA OF HAMSTERS.

A transplantable reticulum cell sarcoma with leukemic manifestations can be transmitted from one hamster to another by means of a mosquito, Aëdes aegypti (L.). The transmission seems to be by a transfer of tumor cells, and not by passage of some other oncogenic agent.

Aedes↗
PubMed1965

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.

Animals↗