Autosomes are known to transfer the somatic characters to the next generation of the same species, while sex chromosomes decide the sex or gender of the upcoming generation. First applied to Drosophila melanogaster Meigen, polytene chromosomes and later employed to obtain whole or partial human chromosome paints Jauch et al.
The present study was designed to seek correlations between cytologically recognizable fish X and Y chromosomes and to establish whether they are related to different genetic make-up or simply to fusion events, perhaps trigged by differential amplification of repetitive DNA fractions.
Genome 51 5 : — Figure 4.
The interstitial chromomycin-positive heterochromatic region of the q arm, corresponding to the region involved in the tandem fusion event Morescalchi et al. Chromosome microdissection has recently been applied to lower vertebrates to generate painting probes for phylogenetic studies Diniz et al.
Author information Article notes Copyright and License information Disclaimer. Polar Biology 16 8 : — Marine Genomics 2 1 : 75— African Journal of Biotechnology 9 : —
On female metaphase plates Fig. The Y chromosomes contain only a few genes, while X chromosome has more than genes. Polar Biology 11 : — Cytogenetic and Genome Research 98 4 : —
Meiotic nondisjunction leads to eggs or sperm with additional or missing chromosomes. Autosomal genes are those not located on the sex chromosomes, X and Y; X-linked genes are those located on the X chromosomes that have no complementary genes on the Y chromosome.
In cold-blooded vertebrates its application may be hampered by difficulties in identifying the chromosomes clearly in the karyotype of the species, where the heteromorphic sex chromosome is often the one most easily recognizable Almeida-Toledo et al.
Among all the organelles, the nucleus is the most vital or essential part of the cell. Heredity 85 : — Then, we used a DNA library established by microdissection and microcloning of the whole Y chromosome of Chionodraco hamatus for searching sex-linked sequences.