The pedigree chart shows the pattern of inheritance for a sex linked trait. The male child has the trait. One of the female children is normal; the other one is only a carrier of the trait. If this couple has another son, what is the probability that he will have the sex linked trait A O% B 25% C 50% D 100%

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.