IN SEX DETERMINATION OF AN UNBORN BABY IF CHROMOSOMES ARE XX THEN IT IS FEMALE AND IF XY THEN A MALE. CAN WE CONCLUDE THAT Y CHROMOSOME IS DOMINANT?
The arrows indicate sex linked genes in the X chromosome. In this homologous pairing, all those genes are dominant, because there are no opposing genes in the Y chromosome to offer dominance.
Y has extremly low number of genes and most of them are related to being male. All the other genes needed get expressed due to the X chromosome. So X chromosome is essential for the survival of Y chromosome because of the number of vital genes it carries.