For a mother who carries the hemophilia gene, the chances of giving birth to a child with hemophilia are the same for each pregnancy. The girl also gets an X chromosome from her mother. In females who have two X chromosomesa mutation would have to occur in both copies of the gene to cause the disorder.
Hemophilia A and hemophilia B are inherited in an X-linked recessive pattern.
Both genes are on the X-chromosome and are tightly linked. This article is merely informative, oneHOWTO does not have the authority to prescribe any medical treatments or create a diagnosis. Individual 1 is homozygous normal. In looking over Henry's family history, you discover that Henry's grandfather expressed a rare genetic disorder.
In X-linked recessive inheritance, a female with one altered copy of the gene in each cell is called a carrier. That is, male.
The disease must be -- a sex-linked b recessive c dominant d caused by an extra chromosome my answer is b. They already have a son who does not have. Are the Jonas brothers step brothers? This means that the presence of a Y chromosome is what causes a fetus to develop as male.
How many brothers did Jabez have? A woman who is a carrier for hemophilia marries a man who does not have hemophilia. Personality disorder B.
These kinds of defects occur more often in men than in women. Females have two X chromosomes in their cells, while males have X and Y chromosomes in their cells. The hemophilia gene seems to appear from nowhere and the family is shocked and confused.
This change in the gene is called a mutation. This is due to different lifestyles and treatments for hemophilia. Hemophilia A.