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.
Located in between Kampala and Mombasa, Nairobi stretches itself across 684 square kilometers of land. It lies adjacent to the eastern edge of the rift valley and is situated 5450 ft (1661 metres) above the sea level. The Ngong hills occupy the western part of the city. Mount Kenya is located to the North of the city and Mount Kilimanjaro lies towards south-east of Nairobi. The Nairobi River along with its tributaries passes through the Nairobi Province. The City Square is located in the heart of the city and the Kenyan Parliament buildings, Nairobi Law Courts, Kenyatta Conference Centre, the Holy Family Cathedral and the Nairobi City Hall surround the square.