The diagram illustrates three generations of a family tree in which an inherited disorder affecting the nervous system appears. This disorder is caused by a dominant allele that usually produces its effect in adulthood. The woman, 4, is showing symptoms of this disorder while she is pregnant. What is the probability that the new baby, 7, will be a girl who will also develop the disorder later in life?
- A0.00
- B0.25
- C0.50
- D1.00