Question

у человека дальтонизм определяется рецессивного сцепленного с полом гена. Тяжёлая форма талассемии-рецессивный признак , зависящий от аутосомного гена; отсутствие талассемии-доминантный признак. В семье отец и сын дальтоники, но не страдают талассемией, а мать имеет нормальное зрение и легкую форму талассемии. Какова вероятность рождения в этой семье дочери с дальтонизмом и легкой формой талассемии?​

Answer 1

Ответ:

дальтонизм вероятен на 50%, тк женщина не дальтоник (доминтная гомозигота), а мужчина - дальтоник, талассемия 50% тк мужчина здоров, а женщина геторозигота. Итого 0.5*0.5 = 0.25 или 25%

Объяснение:

Answer 2

Daltonism and Thalassemia in a Family

In this family, the father and son have Daltonism (color blindness), but they do not have thalassemia. The mother has normal vision and a mild form of thalassemia. The question is about the probability of their daughter having both Daltonism and a mild form of thalassemia.

Daltonism and its Inheritance Pattern

Daltonism, also known as color blindness, is a genetic condition that affects a person's ability to perceive certain colors. It is primarily caused by a recessive gene located on the X chromosome, making it a sex-linked trait. This means that the gene responsible for Daltonism is carried on the X chromosome and is more commonly expressed in males.

Thalassemia and its Inheritance Pattern

Thalassemia is a genetic blood disorder characterized by abnormal hemoglobin production. It can be inherited in an autosomal recessive manner, meaning that both copies of the gene must be affected for the disorder to be present. Individuals who have only one copy of the gene are carriers and typically do not show symptoms of the disorder.

Probability of the Daughter Having Daltonism and a Mild Form of Thalassemia

To determine the probability of the daughter having both Daltonism and a mild form of thalassemia, we need to consider the inheritance patterns of both conditions.

Since Daltonism is a recessive trait on the X chromosome, the father must have one copy of the Daltonism gene on his X chromosome, and the mother must be a carrier or have the Daltonism gene on one of her X chromosomes. The son inherits the father's X chromosome, which carries the Daltonism gene, and therefore has Daltonism. The daughter, on the other hand, has a 50% chance of inheriting the Daltonism gene from the mother.

For thalassemia, the mother has a mild form of the disorder, which suggests that she is a carrier. The father does not have thalassemia, so he does not carry the gene for the disorder. The daughter has a 50% chance of inheriting the thalassemia gene from the mother.

To calculate the probability of both conditions occurring together, we multiply the probabilities of each event. Therefore, the probability of the daughter having both Daltonism and a mild form of thalassemia would be:

Probability of Daltonism in daughter = 0.5 (from the mother) Probability of mild thalassemia in daughter = 0.5 (from the mother)

Probability of both conditions occurring together = 0.5 * 0.5 = 0.25 or 25%

Therefore, there is a 25% chance that the daughter in this family will have both Daltonism and a mild form of thalassemia.

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