That is the factor that is determining the sex of this offspring—mother, daddy, or both moms and dads? This fundamental theory proposes a brand brand brand new type of intercourse dedication, challenging the present dogma that the male Y chromosome for the dad could be the single determinant for the intercourse for the offspring. Relating to science that is modern the 3 X chromosomes (male XY and female XX) are assumed become comparable, plus the intercourse associated with offspring is decided following the zygote is created. As opposed to this, the hypothesis that is new on theoretical research proposes that the 3 X chromosomes could be differentiated, on the basis of the existence of Barr systems. The X that is first in XX chromosomes and X in male XY chromosomes are similar because they lack Barr human body and therefore are hereby denoted as ‘X’ and known as ancestral chromosomes. The 2nd X chromosome in the feminine cells which can be a Barr human anatomy, denoted as X, is significantly diffent. This X chromosome together with the Y chromosome are described as parental chromosomes.