Question

ПОМОГИТЕ РЕШИТЬ, ЗАВТРА ЭКЗАМЕН, А Я НЕ ШАРЮ(( У отца третья группа крови (гетерозигота) и отрицательный резус, у матери—первая группа и положительный резус (дигомозигота). Определите генотипы родителей, генотипы и фенотипы детей, их группы крови и резус-фактор. Составьте схему решения задачи. Какой закон наследственности проявляется в данном случае?

Answer 1

Генотип отца: B0rr

Генотип матери: 00RR

Тогда скрещивание такое:

P: B0rr × 00RR

Гаметы: Br 0r 0R

F1: 0BRr 00Rr

Генотипы детей: 0BRr - группа крови III, резус положительный;

00Rr - группа крови I, резус положительный.

Answer 2

Problem Analysis:

To determine the genotypes and phenotypes of the parents, as well as the blood groups and Rh factors of the children, we need to understand the inheritance patterns of blood types and Rh factors. In humans, blood type is determined by the presence or absence of certain antigens on the surface of red blood cells, while the Rh factor refers to the presence or absence of the Rh antigen. The ABO blood group system and the Rh factor are inherited independently.

Solution:

1. Determine the genotypes of the parents: - The father has blood type A (heterozygous) and negative Rh factor. This means he could have the genotype AO (heterozygous for blood type A) or AA (homozygous for blood type A). - The mother has blood type O (homozygous) and positive Rh factor. This means she has the genotype OO (homozygous for blood type O).

2. Determine the genotypes and phenotypes of the children: - The ABO blood group system follows the following inheritance patterns: - Blood type A (genotype AA or AO) is dominant over blood type O (genotype OO). - Blood type B (genotype BB or BO) is also dominant over blood type O (genotype OO). - Blood type AB (genotype AB) is codominant, meaning both alleles are expressed. - Since the father has blood type A and the mother has blood type O, the possible genotypes for the children are AO (blood type A) and OO (blood type O). - Therefore, the children can have blood types A or O.

3. Determine the Rh factor of the children: - The Rh factor follows a simple dominant-recessive inheritance pattern. - Since the father has a negative Rh factor and the mother has a positive Rh factor, the possible genotypes for the children are heterozygous (Rh positive) or homozygous recessive (Rh negative). - Therefore, the children can have either a positive or negative Rh factor.

4. Summary of the genotypes, phenotypes, blood groups, and Rh factors: - Father's genotype: AO or AA - Mother's genotype: OO - Possible genotypes of the children: AO, OO - Possible blood types of the children: A, O - Possible Rh factors of the children: positive, negative

5. Inheritance pattern: - The inheritance pattern for blood types follows Mendelian genetics, with blood type A and B being dominant over blood type O. Blood type AB is codominant. - The inheritance pattern for the Rh factor follows simple dominant-recessive genetics, with the Rh positive allele being dominant over the Rh negative allele.

Note: It's important to consult with a medical professional or genetic counselor for accurate and personalized information regarding genetic inheritance and blood types.