Karyomorphology and the C-, G-banding pattern analyses of
chromosomes of the microchiroptera Megaderma lyra lyra Geoflroy were done. The
diploid number 54 with the chromosome formulae n = 14m +12sm+Ist/t and NF = 107
for male, n = 14m+12sm + 1st and NF = 108 for female with relative percentage
length range from 5:23 ± 0.48 to 2.07 ± 0. 17 for autosomes, 5:08 ± 0.99 for
the X and 0.05 ± 0.01 for the Y have been detected. Comparison of the karyotype
and the banding patterns of chromosomes with that of the earlier reports on the
same species collected from different geographical regions showed a
considerable amount of differences in the fine structure of chromosomes, in the
amount of heterochromatin and in the distribution pattern of G-bands; which
might have occurred due to the variation among the different allopatric
populations of the same species. Unlike that of other bats, the presence of
very high amount of constitutive heterochromatin with a unique pattern of its
distribution have been pointed out. The possible roles of pericentric inversion
and addition of extraneous heterochromatin in the evolution of its karyotype
and in speciation in the family Megadermatidae have been discussed.
No comments:
Post a Comment