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.
Nairobi in Culture. Nairobi [(neye-roh-bee)] Capital of Kenya and largest city in the country, located in southern Kenya. Note: It was the capital of British East Africa â Kenya, Uganda, Tanganyika, and Zanzibar (see Tanzania) â from 1905 until the colonies became independent in the early 1960s. Note: Nairobi is a center for tourist safaris.