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.
Joelle Joni JoJo Siwa is the daughter of Jessalynn Siwa. She was previously a contestant on Abby's Ultimate Dance Competition in its second season, finishing in fifth place. JoJo made a small appearance in the fourth season of Dance Moms. She has joined the ALDC elite junior competition team in season 5.