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    A sexual difference in the chromosomes of two species of agamid lizards (1950)
    Springer
    Details
    Publication Date: 1950-01-01
    Print ISSN: 0009-5915
    Electronic ISSN: 1432-0886
    Topics: Biology , Medicine
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    A sexual difference in the chromosomes of two species of agamid lizards (1950)
    Springer
    Chromosoma 3 (1950), S. 208-219 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The diploid number of chromosomes in Calotes versicolor is 34 in the male and 33 in the female. The numerical difference in the two sexes is based on the condition of the sex chromosome; in the male it is present as a homologous pair, while in the female it remains unpaired. The sex chromosome was identified as one of the micro-chromosomes (the chromosome No. 7) in this species. Sitana ponticeriana possesses the diploid number of 46 in the male and 45 in the female. The sex chromosome identified in this form is also one of the micro-chromosomes (chromosome No. 13), which has no partner in the female, whereas in the male it is in the paired state having a homologous mate. It was established therefore that, in both species studied, the female is heterogametic as regards the sex chromosome. The chromosome complement of Calotes versicolor consists of 12 V-shaped macro-chromosomes and 22 dot-like micro-chromosomes, while in Sitana ponticeriana there are 24 rod-shaped macro-chromosomes and 22 dot-like micro-chromosomes. The difference in the karyotypes of these two species can be accounted for on the basis of the formation of V-shaped multiple chromosomes by means of the fusion of two rods at the point of fibre attachment. The karyological relationships in the Family Agamidae were discussed. The chromosome number previously reported for Uromastix hardwicki was found to be erroneous; the diploid number in this species is 34.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319476
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  • 3
    Electronic Resource
    Electronic Resource
    The idiochromosomes of an earwig, Labidura riparia (1934)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 56 (1934), S. 361-369 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The diploid number of chromosomes of a species of Indian earwigs, Labidura riparia, is fourteen; six pairs of autosomes with X and Y idiochromosomes for the male; six pairs of autosomes with X and X for the female.The chromosome distribution is normal, and constant for all the individuals studied.X and Y are derived from a single chromatin nucleolus of the early growth period which assumes a clavate form later, and remains in the same form till the metaphase of the primary spermatocyte is reached.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1050560209
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  • 4
    Electronic Resource
    Electronic Resource
    The chromosomes of schizodactylus monstrosus (1933)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 55 (1933), S. 185-191 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: In this peculiar Orthopteron the chromosomes are unusual in these respects: the number is low for one of the Saltatoria; there is an x-y idiochromosome pair; all the tetrads are individually distinguishable; the chromosomes are small, relatively and actually, in the very large first spermatocyte. The structural peculiarities of the animal are reflected in those of its germ cells, but as yet no correlation has been established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1050550111
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