The Y chromosome does not cause color blindness. Colorblindness is a defective gene on the X chromosome. Females have 2 x chromosomes, thus one can serve as a backup for a defective gene. However, the Y chromosome in males is almost totally defective, thus does not have a backup.olorblindness is a defective gene on the X chromosome. Females have 2 x chromosomes, thus one can serve as a backup for a defective gene. However, the Y chromosome in males is almost totally defective, thus does not have a backup.
Kilwa Kisiwani (also known as Kilwa or Quiloa in Portuguese) is the best known of about 35 medieval trading communities located along the Swahili Coast of Africa.
Some people believe that the hei-tiki represents the goddess of childbirth, Hineteiwaiwa. The first hei tiki ever made, according to Maori mythology, was made for Hineteiwaiwa by her father. And so today, the Hei Tiki has come to represent fertility, and is often worn by a woman trying to conceive.