Variation of constitutive heterochromatin in the sex chromosomes of the rodent Bandicota bengalensis bengalensis (Gray) |
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Authors: | T Sharma Rajiva Raman |
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Institution: | (1) Cytogenetics Laboratory, Department of Zoology, Banaras Hindu University, Varanasi |
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Abstract: | Bandicota bengalensis bengalensis (Gray) trapped from different localities of India and Nepal exhibited a marked variation in the size and morphology of sex chromosomes. Three types of X's were found; A) simple acrocentric, B) composite subtelocentric and C) composite submetacentric X with their relative sizes 5.9%, 7.5% and 9.6% of the genome respectively. The autosomes remained unaltered. It was shown that this variation in the size of sex chromosomes was caused by deletion of constitutive heterochromatin. The Y chromosome was also found to be variable. Usually a large X was combined with a large Y. The preponderance of homozygotes for each type of X chromosome in populations, suggested the probable role of sex chromosomes heterochromatin in speciation. |
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