Question

Дальтонизм (цветовая слепота) наследуется как рецессивный признак, контролируемый геном, сцепленным с Х-хромосомой. В семье, где жена –носительница гена дальтонизма, а муж страдает дальтонизмом. Вероятность рождения в этой семье детей нормально различающих цвета?1. 0%2. 25%3. 50%4. 100%

Answer 1

3.50%

девочки носители(хАха) и мальчики здоровые(хАY)

Answer 2

2-25%
чисто моё мнение))))))))))))))))))) 

Answer 3

Daltonism (color blindness) inheritance

Daltonism, also known as color blindness, is a genetic condition that is inherited as a recessive trait controlled by a gene located on the X chromosome. In a family where the wife is a carrier of the daltonism gene and the husband is affected by daltonism, what is the probability of having children who can perceive colors normally?

To determine the probability, we need to consider the inheritance pattern of daltonism and the genotypes of the parents.

Inheritance pattern of daltonism

Daltonism is an X-linked recessive trait. This means that the gene responsible for daltonism is located on the X chromosome. Males have one X chromosome and one Y chromosome, while females have two X chromosomes.

If a male inherits the daltonism gene on his X chromosome, he will be affected by daltonism because the Y chromosome does not have a corresponding gene to compensate for the defect. On the other hand, females need to inherit the daltonism gene on both of their X chromosomes to be affected by daltonism. If they inherit the gene on only one X chromosome, they will be carriers of the gene but will not be affected by daltonism.

Genotypes of the parents

In this case, the wife is a carrier of the daltonism gene, which means she has one normal X chromosome and one X chromosome carrying the daltonism gene. The husband is affected by daltonism, which means he has one X chromosome carrying the daltonism gene and one Y chromosome.

Let's represent the genotypes of the parents: - Wife: X^N X^D (N represents the normal gene, D represents the daltonism gene) - Husband: X^D Y

Probability of having children who can perceive colors normally

To determine the probability of having children who can perceive colors normally, we need to consider the possible combinations of the parents' genotypes and the resulting genotypes of their children.

Possible combinations of genotypes for the children are: - X^N X^D (carrier daughter) - X^N Y (normal son)

The probability of having a carrier daughter (X^N X^D) is 50%, as the wife is a carrier of the daltonism gene.

The probability of having a normal son (X^N Y) is also 50%, as the son will inherit the normal X chromosome from the mother and the Y chromosome from the father.

Therefore, the probability of having children who can perceive colors normally in this family is 50%.