Question

У человека брахидактилия – доминантный признак. Какова вероятность рождения больного ребёнка при браке больного мужчины (мать мужчины была здорова) и здоровой женщины? Гены расположены в аутосоме.

Answer 1

Фенотип ген генотип
брахидак. А   АА,Аа
норма       а     аа
Решение
Р мать аа * отец Аа
G         а            А,а
F1  Аа,       аа
      50%  /   50%
      больны/ здоровы
Ответ: вероятность рождения больного ребенка равна 50%.

Answer 2

А - болен  а-здоров
Р: Аа(бол) * аа(здорова)
Г:  А  а    а
дети : Аа(болен)  аа(здоров)
Вероятность рождения больного 50 процентов.

Answer 3

Brachydactyly and Inheritance Probability

Brachydactyly is a condition characterized by shortening of the fingers and toes. When considering the inheritance of brachydactyly, it's important to understand the genetic basis of the condition.

Brachydactyly as a Dominant Trait: - Brachydactyly is considered a dominant trait, meaning that only one copy of the gene is needed for the trait to be expressed.

Probability of Having an Affected Child: - When a person with a dominant condition like brachydactyly has a child with a person who does not carry the dominant gene, there is a 50% chance that their child will inherit the dominant gene and express the trait, and a 50% chance that the child will not inherit the dominant gene and will not express the trait.

Specific Scenario: - In the specific scenario provided, where the father is affected by brachydactyly and the mother is unaffected, the probability of having an affected child can be calculated.

Probability Calculation: - In this case, since the father is affected, he must carry at least one dominant allele for brachydactyly. The mother, being unaffected, would not carry any dominant alleles for brachydactyly. - When the father (affected) and the mother (unaffected) have a child, there is a 50% chance that the child will inherit the dominant allele from the father and express brachydactyly, and a 50% chance that the child will not inherit the dominant allele and will not express the trait.

Conclusion: - Therefore, in the given scenario, the probability of the couple having an affected child is 50%.

It's important to note that these probabilities are based on Mendelian genetics and assume no other complicating factors.

If you have further questions or need more information, feel free to ask!