Hemophilia A is an X-linked recessive disease caused by a lack of a coagulant, or blood clotting agent, called factor VIII factor 8. Genes on the Y chromosome do not exactly pair up with the genes on the X chromosome.
In humans, inheritance of X-linked recessive traits follows a unique pattern made up of three points.
Huntington diseaseMarfan syndrome. Archived from the original on 21 November Okay, thank you.
In humans, male gametes are spermatozoa sperm cells and female gametes are ova or eggs. This pattern of sex determination occurs in most vertebrates, but in birds and many insects and fish the male is the homogametic sex. Archived from the original on From Wikipedia, the free encyclopedia.
Female carriers can have a normal X chromosome that is abnormally inactivated. We generally send out our monthly newsletter at the end of each month. Medical Genetics. The first is that affected fathers cannot pass x-linked recessive traits to their sons because fathers give Y chromosomes to their sons.