The recent development of oligo painting probes in plants has proved to be useful in the detection of chromosomal aberrations and in comparative cytogenetics reviewed in Jiang, Journal of Systematics and Evolution. Jump to main content. Chromosome-specific painting in Cucumis species using bulked oligonucleotides.
Labeling and detection of the oligo painting probe followed the published protocol of Han et al. These histograms display the distribution of DNA probes along each chromosome arm.
The 0 denotes the absence of a second sex chromosome. Cellular and Molecular Life Sciences 55 : — The name gamete was introduced by the German cytologist Eduard Strasburger. In some species of reptiles, including alligatorssome turtlesand the tuatarasex is determined by the temperature at which the egg is incubated during a temperature-sensitive period.
Diploid individuals are generally female but may be sterile males. Main article: Temperature-dependent sex determination.
This could be due to environmental factors such as seasons and temperature. A number of candidate genes can still be tested for their linkage to the sex locus of rainbow trout. Bergero, R. March
Table 4 Typing of Sox6 genes and alleles by sequence polymorphisms in rainbow trout crosses. At least one monotreme , the platypus , presents a particular sex determination scheme that in some ways resembles that of the ZW sex chromosomes of birds and lacks the SRY gene.
Based on the oligo painting probe signal in this study, two scenarios supported by the literature could led to the formation of sex chromosomes in S. Downstream genes are conserved between the different phyla, regardless of the sex-determination mechanism, and thus seem to have been present for a much longer time.