Question

20 баллов! ОЧЕНЬ СРОЧНО Распишите брак женщины (переносчик гемофилии) и мужчины, их гаметы и потомства, определить их фенотип и генотип

Answer 1

Решение на фоточке ........................................
 

Answer 2

Marriage between a woman (hemophilia carrier) and a man, their gametes, offspring, phenotype, and genotype

When a woman who is a carrier of hemophilia marries a man, there are certain possibilities for their gametes, offspring, phenotype, and genotype. Hemophilia is a genetic disorder that affects the blood's ability to clot properly. It is caused by a mutation in the genes responsible for producing clotting factors.

Gametes of the Woman (Hemophilia Carrier):

As a carrier of hemophilia, the woman has one normal X chromosome and one X chromosome with the hemophilia gene. During meiosis, the process of cell division that produces gametes (eggs), the woman's cells will randomly divide and segregate the X chromosomes. This means that she can produce two types of eggs:

1. Eggs with the normal X chromosome. 2. Eggs with the X chromosome carrying the hemophilia gene.

Gametes of the Man:

The man, who does not have hemophilia, has one X chromosome and one Y chromosome. During meiosis, his cells will divide and produce two types of sperm:

1. Sperm with the X chromosome. 2. Sperm with the Y chromosome.

Offspring:

When the woman and man have children, the combination of their gametes will determine the genotype and phenotype of the offspring. Let's consider the possibilities:

1. If the woman's egg with the normal X chromosome is fertilized by a sperm with the X chromosome, the child will be a carrier of hemophilia (like the mother) but will not have the disorder. This is because the child will have one normal X chromosome and one X chromosome with the hemophilia gene. The child's genotype will be X^H X, where X^H represents the normal X chromosome and X represents the X chromosome with the hemophilia gene. The child's phenotype will be normal, as the presence of one normal X chromosome is sufficient to produce enough clotting factors.

2. If the woman's egg with the X chromosome carrying the hemophilia gene is fertilized by a sperm with the X chromosome, the child will be a male with hemophilia. This is because the child will inherit the X chromosome with the hemophilia gene from the mother and the Y chromosome from the father. The child's genotype will be X^H Y, where X^H represents the X chromosome with the hemophilia gene and Y represents the Y chromosome. The child's phenotype will be hemophilia, as there is no normal X chromosome to produce enough clotting factors.

3. If the woman's egg with the normal X chromosome is fertilized by a sperm with the Y chromosome, the child will be a female without hemophilia. This is because the child will inherit the normal X chromosome from the mother and the Y chromosome from the father. The child's genotype will be X X, where X represents the normal X chromosome. The child's phenotype will be normal, as the presence of one normal X chromosome is sufficient to produce enough clotting factors.

4. If the woman's egg with the X chromosome carrying the hemophilia gene is fertilized by a sperm with the Y chromosome, the child will be a male without hemophilia. This is because the child will inherit the X chromosome with the hemophilia gene from the mother and the Y chromosome from the father. The child's genotype will be X^H Y, where X^H represents the X chromosome with the hemophilia gene and Y represents the Y chromosome. The child's phenotype will be normal, as the presence of one normal X chromosome is sufficient to produce enough clotting factors.

Summary:

In summary, when a woman who is a carrier of hemophilia marries a man, the possible outcomes for their offspring are as follows:

- Female child: 50% chance of being a carrier of hemophilia, 50% chance of being without hemophilia. - Male child: 50% chance of having hemophilia, 50% chance of being without hemophilia.

It is important to note that these probabilities are based on the assumption that the inheritance of the X and Y chromosomes is random and independent. In reality, there may be other factors that can influence the inheritance patterns.

Please let me know if you have any further questions!