If Women has red hair and brown eyes and Man has Black hair and brown eyes? What would the baby have? Is black hair a dominant gene?

Yes, it is a dominant gene.

Explanation:

Because it is the most common hair color in the world.

i thinking chemical change

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.