Possible mechanisms of the origin of sex chromosomes in this species are discussed, considering the presence of a sex-linked marker and ITSs.SUBJECT EDITOR: Audrey J. GeffenKEYWORDS: Anguilliformes, karyotype evolution, Ophisurus serpens, rDNA, telomeric sequences, XX/XY sex chromosome...
male honey bees andantsreceive chromosomes only from the female parent (the Queen). This means that they develop from unfertilized (haploid) eggs and don’t have a father, whereas fertilized (diploid) eggs produce female progeny!
Regenerating worm tips and gamete-bearing segments were used for the analysis. A diploid chromosome number of 34 was found in well-spread metaphase plates of somatic cells. A pair of sex chromosomes (XY) with the Y considerably larger than the X was found in males. The size and shape of ...
Recently, the influence of the XX vs. XY sex chromosome complement on immune cell activation has become increasingly appreciated. The X chromosome encodes for a large number of immune-related genes, as well as epigenetic regulators associated with lymphocyte activation and differentiation [15].While ...
and male or female gonads. Pro-atherogenic lipids and atherosclerosis are greater in XX than XY mice, indicating a primary effect of sex chromosomes. Small intestine expression of enzymes involved in lipid absorption and chylomicron assembly are greater in XX male and female mice with higher intesti...
Thus, species with male-specific RAD markers have an XX/XY sex chromosome system (male heterogamety) while species with female-specific RAD markers have a ZZ/ZW sex chromosome (female heterogamety). Here we use RADseq data from five male and five female South American dwarf geckos (Gonato...
Cytogenetic studies carried out in the two populations showed that the Mogi-Guaçu population is characterized by 2n = 38 chromosomes and undifferentiated sex chromosomes and the Tietê population presents 2n = 38 both for males and females and an XX:XY sex chromosome system. The X-chromosome ...
Turtles demonstrate variability in sex determination and, hence, constitute an excellent model for the evolution of sex chromosomes. Notably, the sex determination of the freshwater turtles from the family Chelidae, a species-rich group with wide geograp
首先，XY不是基因是染色体，染色体上存在很多基因，其次，X染色体在体积上远大于Y染色体。图为人类的23对...
Sex determination in mammals is usually provided by a pair of chromosomes, XX in females and XY in males. Mole voles of the genus Ellobius are exceptions to this rule. In Ellobius tancrei, both males and females have a pair of XX chromosomes that are indistinguishable from each other in so...