Only the complete conserved region of the PcP sequences were used in the maximum likelihood analysis. Nature ; : — Variations include:. The influence of sex chromosomes on finger dermatoglyphic patterns.
The accumulation of PcP sequences in the heterochromatin of the W chromosome of Pseudis tocantins suggests that the PcP sat DNA may have played a relevant role in the process of sex chromosome differentiation in this species.
Among the seven species of this genus, only Pseudis tocantins Caramaschi and Cruz [ 28 ] has heteromorphic Z and W sex chromosomes [ 29 ]. Valenzuela N. Iturra P, Veloso A. Fig 2. Dover G. Learn more about our commitment to Global Medical Knowledge.
Over time, some of the mutations on the Y chromosome have resulted in the deletion of genes and have contributed to the decrease in the size of the Y chromosome. Another type of mutation occurs during meiosis and causes cells to have either too many or not enough chromosomes.
The inactivated X chromosome typically replicates later than other chromosomes, and it physically condenses to form a Barr bodya small structure found at the rim of the nucleus in female somatic cells between divisions see photograph. The body shape, however, is more feminine narrow shoulders, broad hips with a lower muscle mass.
Data Availability All relevant data are within the paper and its Supporting Information files. The karyotype most commonly associated with this condition is 47,XXY. CC Thomas Publ.