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.
Kisii is a city in south-western Kenya. It is the main urban and commercial center in the Gusii Highlands and the South Nyanza region. A vibrant town, the Kisii municipality has a population of about 400,000, according to 2012 estimates. It has a large dependent metropolitan population of over 100,000 residents, as per the latest national population and housing census of 2009. Kisii town is the capital of the Kisii County.