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 is the capital city of Kenya and East Africa's most populous city (3.5 million). Nairobi was founded in 1899 as a railway stop en route to Mombasa. Within a decade it grew to become the capital of British East Africa and became Kenya's capital after independence in 1963.Nairobi is a major business hub and many Aid agencies headquarter here as well.Nairobi has a modern city center, some beautiful suburbs, as well as Africa's largest slum.ithin a decade it grew to become the capital of British East Africa and became Kenya's capital after independence in 1963. Nairobi is a major business hub and many Aid agencies headquarter here as well. Nairobi has a modern city center, some beautiful suburbs, as well as Africa's largest slum.