What is the risk of hemophilia for her children?
II3 in the pedigree below has two brothers with hemophilia A, a bleeding disorder that is inherited as an Xlinked recessive trait.
A. 1 in 4 for a son, close to zero for a daughter B. 1 in 2 both for sons and daughters C. 1 in 2 for a son and 1 in 4 for a daughter D. 1 in 2 for a son, close to zero for a daughter E. 1 in 4 both for sons and daughters
The correct answer to this question is A, 1 in 4 for a son, close to zero for a daughter. This question includes a diagram, and the diagram is a pedigree. Pedigrees help show a relationship between an organism and the generations that came before the current organism. Many types of organisms benefit from pedigrees, including humans and dogs.
The diagram is easy to use and includes all kinds of important family information. Pedigrees include symbols that all represent something. The circles in the diagram represent females, and the squares represent males. Roman Numerals represent the generations.
The correct answer to this question is A, 1 in 4 for a son, close to zero for a daughter. The diagram in this question is called a pedigree chart. This chart shows family information in an easy to read form. The symbols in the chart all represent something. Circles represent females, and squares represent males.
The different Roman numerals represent the generations. I am generation one, II, is generation two, and so on and so forth. As this question shows, the chart can be used to analyze genes in humans, as well as dogs and horses. In animals, this chart can be used for selective breeding.