AI Article Synopsis
- The paper presents the first G-band patterns of the metaphase chromosomes for the amphioxus species Branchiostoma belcheri tsingtauense, marking a significant advancement in cephalochordate chromosome studies.
- Out of ten second pair chromosomes, four are heteromorphic and six are homomorphic, while all 17 other chromosomes are homomorphic, suggesting that chromosome No. 2 may be sex chromosomes.
- The G-banding technique effectively stains 65.5% of the chromosome surface, revealing a total of 149 G-bands with varying characteristics across the chromosomes.
Article Abstract
Chromosome banding study remains lacking in amphioxus heretofore. This paper reports the G-band patterns of the metaphase chromosomes of amphioxus Branchiostoma belcheri tsingtauense, the first description and numbering of the karyotyped bands in a cephalochordate. G-banding results show that four out of the ten second pair chromosomes examined are heteromorphic, while the remaining ones (6/10) are homomorphic. In contrast, the other 17 pair chromosomes are all homomorphic. These broadly support our previous suggestion that the chromosomes No. 2 are a pair of sex-chromosomes. G-banding method stains positively 65.5% of the chromosome surface, and a total of 149 G-bands (77 positive, 65 negative and 7 variable) has been recorded in the 17 autosomes and the dimorphic chromosomes 2A' and 2A.
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| http://dx.doi.org/10.1111/j.1601-5223.2004.01750.x | DOI Listing |
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