Question

Одна из форм шизофрении наследует как рецессивный признак.Определите вероятность рождения ребенка с шизофренией от здоровых родителей если известно что они оба гетирозиготные по этому признаку

Answer 1

А-доминантный признак-здоров,
а-рецессивный признак-шизофрения,
Р: жАа × мАа
G: A, a__A, a
F1:АА : Аа : Аа : аа
75%-здоровые, 25%-больны
Ответ:25% вероятность рождения детей больных шизофренией.

Answer 2

Schizophrenia Inheritance and Probability of Child's Schizophrenia

Schizophrenia is a complex mental disorder that is influenced by both genetic and environmental factors. While there is no single gene responsible for schizophrenia, research suggests that there is a genetic component to the disorder. However, the inheritance pattern of schizophrenia is not well understood, and it is likely influenced by multiple genes.

It is mentioned that both parents are heterozygous carriers for the recessive trait associated with schizophrenia. In this case, we can assume that the trait follows a recessive inheritance pattern.

In a recessive inheritance pattern, an individual must inherit two copies of the recessive allele (one from each parent) in order to express the trait. If both parents are heterozygous carriers, they each have one copy of the recessive allele and one copy of the dominant allele.

To determine the probability of their child having schizophrenia, we can use a Punnett square to analyze the possible combinations of alleles that the child can inherit from the parents.

Let's represent the dominant allele as "A" and the recessive allele as "a". Since both parents are heterozygous carriers, their genotypes can be represented as "Aa".

The Punnett square for this cross would look like this:

      A       a
A   AA     Aa
a   Aa     aa

From the Punnett square, we can see that there is a 25% chance (1 out of 4) that the child will inherit two copies of the recessive allele (aa) and therefore have schizophrenia. This means that the probability of the child having schizophrenia is 25%.

It is important to note that this is a simplified analysis and does not take into account other genetic and environmental factors that may influence the development of schizophrenia. Additionally, the inheritance pattern of schizophrenia is not fully understood, and it is likely influenced by multiple genes.

In summary, if both parents are heterozygous carriers for the recessive trait associated with schizophrenia, there is a 25% probability that their child will have schizophrenia.