Question

У человека наследственную глухонемота обусловливает реццесивный ген. Наследственно глухонемой мужчина женился на женщине с нормальным слухом. У них родился глухонемой ребенок. Можно ли определить генотип матери

Answer 1

А - норма слух

а - глухота

отец - аа

мать А- (или АА или Аа)

ребенок аа

следовательно, один аллель а он получил от отца, другой - от матери. значит генотип матери Аа

Р Аа х аа

F1 Аа: аа

(норм : глухонемота)

Answer 2

Determining the Genotype of the Mother in a Case of Inherited Deafness

In this scenario, a man with inherited deafness marries a woman with normal hearing, and they have a deaf child. The question is whether it is possible to determine the genotype of the mother based on this information.

To answer this question, we need to understand the inheritance pattern of deafness and the possible genotypes of the parents.

Inheritance Pattern of Deafness: Deafness can be caused by various factors, including genetic mutations. In this case, the inherited deafness is determined by a recessive gene. This means that a person needs to inherit two copies of the deafness-causing gene (one from each parent) to be deaf.

Possible Genotypes of the Parents: 1. Deaf father: dd (homozygous recessive for the deafness gene) 2. Normal-hearing mother: ?? (unknown genotype)

Based on this information, we can determine the possible genotypes of the mother by considering the deaf child's genotype.

Genotype of the Deaf Child: Since the child is deaf, they must have inherited the deafness-causing gene from both parents. Therefore, the genotype of the deaf child is dd.

Now, let's consider the possible genotypes of the mother based on the genotype of the deaf child.

1. If the mother is homozygous for the deafness gene (dd), then all her children would be deaf. However, this contradicts the information provided, as the couple has at least one child with normal hearing.

2. If the mother is heterozygous for the deafness gene (Dd), then there is a 50% chance of passing on the deafness-causing gene to each child. This would explain why the couple has both deaf and hearing children.

Therefore, it is possible to determine that the genotype of the mother is likely Dd, meaning she carries one copy of the deafness-causing gene and one copy of the normal gene.

Please note that this is a general explanation based on the information provided. The actual genotype of the mother can only be determined through genetic testing.