Question

2. Здоровая женщина со второй группой крови, отец которой имел первую группу крови и страдал гемофилией, вышла замуж за здорового мужчину с четвёртой группой крови. Какова вероятность рождения в этой семье сына с третьей группой крови, не больного гемофилией (среди всех потомков)? Ответ дайте в виде десятичной дроби, не округляя.

Answer 1

Такого не может быть ,вообще, только может быть у ребенка будет 4 группа от отца и только,а может от матери

Answer 2

Probability of Child's Blood Type and Hemophilia Status

To calculate the probability of the couple having a son with blood type III (A or B) and not suffering from hemophilia, we need to consider the inheritance patterns of blood types and hemophilia.

Blood Type Inheritance: - The mother has blood type II (A) and the father has blood type I (O). - The child's blood type is determined by the combination of the parents' genes. - The possible blood types for the child are A (II), B (III), AB (IV), or O (I).

Hemophilia Inheritance: - Hemophilia is a recessive genetic disorder carried on the X chromosome. - The father has hemophilia, so he must have the genotype XhY. - The mother does not have hemophilia, so she must have the genotype XX.

Probability Calculation

1. Blood Type Inheritance: - The child's blood type is determined by the combination of the parents' genes. - The possible blood types for the child are A (II), B (III), AB (IV), or O (I).

2. Hemophilia Inheritance: - Since the father has hemophilia (XhY), he will pass the Y chromosome to his son, so the son will not inherit hemophilia from him. - The mother does not have hemophilia (XX), so she will not pass on the hemophilia gene to her son.

3. Probability of Blood Type III (B) and Non-Hemophilia: - The probability of the son having blood type III (B) is 1/2, as the father's genotype is OO (blood type O) and the mother's genotype is either IO (blood type A) or IO (blood type B). - Since the father has hemophilia, the son will inherit the Y chromosome from him, so the son will not inherit hemophilia. - Therefore, the probability of the son having blood type III (B) and not suffering from hemophilia is 1/2.

Hence, the probability of the couple having a son with blood type III (B) and not suffering from hemophilia is 1/2.