Are all stars exactly like the sun

No

Explanation:

There are different stages in a star's life depending on it's mass. There might be stars similar to the Sun, but stars are not all exactly the same.

answer; a male inherits only one allele of the x-linked gene controlling hair color;

the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.