哈哈哈。
偶不曉得Y的穩定性是不是比X強, 但是X比Y大。
Introduction of X chromosome will also offer an opportunity to reduce mental illness.
http://universe-review.ca/R11-14-Ychromosome.htm
X chromosome carry genes that do not have opposing genes in Y, so they are dominant genes in boys.
http://www.biology-online.org/2/6_sex_chromosomes.htm
All in all, X chromosome is more powerful! :))