Question

ПОМОГИТЕ РЕШИТЬ ЗАДАЧУ!!! СРОЧНО!!! С РЕШЕНИЕМ!!! Женщина блондинка являющаяся носительницей гена гемофилии вышла замуж за мужчину гетерозиготного брюнета гемофилика. Определите генотипы и фенотипы детей родившихся от данного брака. Определите, может ли родиться дочка блондинка больная гемофилией.

Answer 1

Ответ:

Генотипы родителей ХН Хh и ХHУ;

генотипы потомства — ХН Хh, ХН ХH, ХН У, ХhУ. Соотношение генотипов 1:1:1:1

дочери — носительница гена гемофилии, здоровая, а сыновья — здоров, болен гемофилией. Соотношение фенотипов 2 (девочки здоровы): 1 (мальчик здоров) : 1 (мальчик-гемофилик)

Объяснение:

Answer 2

Problem Analysis

In this problem, we are given a scenario where a blonde woman, who is a carrier of the hemophilia gene, marries a heterozygous brunette man who has hemophilia. We need to determine the genotypes and phenotypes of the children born from this marriage and whether it is possible for them to have a blonde daughter with hemophilia.

Solution

To solve this problem, we need to understand the inheritance patterns of the hemophilia gene and the possible genotypes and phenotypes of the offspring.

1. Hemophilia Inheritance: - Hemophilia is an X-linked recessive disorder, which means it is carried on the X chromosome. - Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY). - The hemophilia gene is located on the X chromosome. - Females can be carriers of the hemophilia gene if they have one normal X chromosome and one X chromosome with the hemophilia gene (Xh). - Males with the hemophilia gene on their X chromosome will have hemophilia because they do not have a second X chromosome to compensate for the defective gene.

2. Genotypes and Phenotypes of the Children: - Let's consider the genotypes of the parents: - The woman is a carrier of the hemophilia gene, so her genotype is XhX. - The man is heterozygous for the hemophilia gene, so his genotype is XhY. - When the parents have children, there are four possible combinations of their genotypes: 1. XhXh (female child with hemophilia) 2. XhX (female child without hemophilia, but a carrier) 3. XhY (male child with hemophilia) 4. XY (male child without hemophilia) - Therefore, the possible genotypes and phenotypes of the children are: - 25% chance of having a female child with hemophilia (XhXh) - 25% chance of having a female child without hemophilia, but a carrier (XhX) - 25% chance of having a male child with hemophilia (XhY) - 25% chance of having a male child without hemophilia (XY)

3. Possibility of a Blonde Daughter with Hemophilia: - The hair color of the children is not determined by the hemophilia gene but by other genes that control hair color. - Since the mother is blonde, there is a possibility that her daughter may also be blonde. - However, the presence of the hemophilia gene does not affect the hair color. - Therefore, it is possible for a blonde daughter to be born with hemophilia.

Conclusion

In summary, the genotypes and phenotypes of the children born from the marriage between a blonde woman who is a carrier of the hemophilia gene and a heterozygous brunette man with hemophilia are as follows: - 25% chance of having a female child with hemophilia (XhXh) - 25% chance of having a female child without hemophilia, but a carrier (XhX) - 25% chance of having a male child with hemophilia (XhY) - 25% chance of having a male child without hemophilia (XY)

It is possible for a blonde daughter to be born with hemophilia, as the presence of the hemophilia gene does not affect the hair color.