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.
It was located in the valley of the Medicine Lodge River, several miles below the present town of Medicine Lodge, which is at the mouth of Elm Creek. In their own language, the Kiowa people called this stream A-ya-dalda Pâa, meaning Timber-hill River. The Kiowa had considered the site sacred due to the high content of Epsom salts in the river.