Unlike most snakes, Boa imperator was reported to have XY homomorphic sex chromosomes26, and its sister species Boa constrictor, shares ancestry presenting also an XY system. Therefore, it is plausible that transitions between homomorphic ZW and XY have occurred in the Boidae family without much ...
and generally represents a transition from gonochorism to hermaphroditism (as in the androdioeciousCaenorhabditis elegans), likely due to selection for reproductive assurance rather than the reverse direction of change2,9,10,11. In animals, transitions from hermaphroditic ancestors to androdioecy ...
[2002] and Rocha-Sanchez and Pompolo [2004], it is performed by the parasite itself through its tendency to pair during female meiosis. In diploid organisms, there are several possibilities for B chromosomes to be integrated into the A genome. One is by translocation to an A chromosome. ...
for each of the most classical Yq deletions removes multiple genes.The importance of the X chromosome in mammalian spermatogenesis is suggested by its enrichment of germ cell-specific genes expressed in spermatogenesis,such as AR,USP26,TAF7L,TEX11,KAL1,AKAP4,and NXF2.Genes on the X chromosome...
(2003). Chromosomes: Organization and Function. Alberts B, Johnson A, and Lewis J, et al. (2002). Chromosomal DNA and Its Packaging in the Chromatin Fiber. Molecular Biology of the Cell. 4th edition. Cooper GM. (2000). The Cell: A Molecular Approach. 2nd edition....
These findings indicate that it is highly likely that recombination has ceased between the inverted neo-Y region and its homolog. Degeneration in coding regions of neo-Y-linked genes Because of the limited sample size of neo-Y alleles, the polymorphism data exhibit a high degree of variance, ...
Comparative studies of the genes involved in sex determination in the three extant classes of mammals, and other vertebrates, has allowed us to identify genes that are highly conserved in vertebrate sex determination and those that have recently evolved roles in one lineage. Analysis of the conserva...
1.A linear strand of DNA and associated proteins in the nucleus of eukaryotic cells that carries the genes and functions in the transmission of hereditary information. 2.A circular strand of DNA in bacteria and archaea that contains the hereditary information necessary for cell life. ...
This QTL explained 93.2% of the variation in fruit set and its peak was within 1.27 cM of male sterility. In the WREN7 Â MP10 cross, only a quantitative approach to mapping female function was possible. In the maternal map, a QTL that explained 91.3% variation in fruit-setting ability...
1c). Chromosome 22 is a microchromosome and had its entire length added to the ancient-sex chromosome. This resembles the formation of the neo-sex chromosomes in parrots where an entire microchromosome (chromosome 11) joined the sex chromosome and unlike the scenario in songbirds only a part ...