Question

Помогите решить задачу по биологии, пожалуйста! У человека ген дальтонизма рецессивный признак сцеплен с х хромосом. Мужчина страдающий дальтонизмом женился на женщине с нормальным зрением, но имеющую отца дальтоника.

Answer 1

Я думаю вероятность того что ребенок родится с далтоником

Answer 2

Daltonism and Inheritance

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. In humans, males have one X and one Y chromosome (XY), while females have two X chromosomes (XX).

When a man with daltonism marries a woman with normal vision but whose father is daltonic, there is a possibility of passing on the daltonism gene to their children. Let's explore the inheritance patterns and the likelihood of their children inheriting daltonism.

Inheritance Patterns

Since the daltonism gene is located on the X chromosome, the inheritance pattern follows a sex-linked recessive pattern. This means that the gene is recessive and must be present on both X chromosomes for a female to be affected, while males only need one copy of the gene to be affected.

Probability of Inheritance

In this case, the man with daltonism has one X chromosome with the daltonism gene, and the woman has two X chromosomes, one of which she inherited from her father who is daltonic. Let's consider the possible scenarios for their children:

1. Sons: - If the man passes on his Y chromosome, the son will not inherit daltonism. - If the man passes on his X chromosome with the daltonism gene, the son will be affected by daltonism. - Therefore, there is a 50% chance that their sons will inherit daltonism.

2. Daughters: - If the woman passes on her X chromosome without the daltonism gene, the daughter will not be affected by daltonism. - If the woman passes on her X chromosome with the daltonism gene, the daughter will be a carrier of daltonism but not affected. - Therefore, there is a 50% chance that their daughters will be carriers of daltonism.

Conclusion

To summarize, if a man with daltonism marries a woman with normal vision but whose father is daltonic, there is a 50% chance that their sons will inherit daltonism and a 50% chance that their daughters will be carriers of the daltonism gene. It's important to note that these probabilities are based on the assumption that the daltonism gene is the only factor influencing color blindness and that no other genetic factors are involved.

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