Question

У отца волнистые и тёмные волосы, у матери светлые и прямые волосы. Какие будут у детей Варианты: 1) 50% светлые волнистые, 50%темные прямые волосы 2)75%темные волнистые, 25% светлые прямые 3)100% светлые прямые 4)100% темные волнистые 5)75% темные прямые, 25% светлые волнистые 6)50% светлые прямые, 50% темные волнистые

Answer 1

Ответ:

Решение:

Вводим сокращения: в. - волнистые, т. - тёмные, п. - прямые, с. - светлые.

1) Проведём скрещивание и найдём фенотипы и генотипы потомства:

P ♂ AaBb x ♀ aabb

в. т. п. с.

G AB, Ab ab

aB, ab

F AaBb, Aabb, aaBb, aabb

в. т. в. с. п. т. п. с.

В результате в потомстве четыре разных генотипа и четыре разных фенотипа: AaBb - волнистые темные; Aabb - волнистые светлые; aaBb - прямые тёмные; aabb - прямые светлые.

наверное всё-таки преобладает темный и волнистый

мой ответ: 2

Answer 2

Genetic Inheritance of Hair Traits

When predicting the potential hair traits of offspring based on the parents' characteristics, it's important to consider the principles of genetic inheritance. In this case, the father has wavy and dark hair, while the mother has light and straight hair. The inheritance of these traits follows the laws of genetics, specifically the principles of dominant and recessive genes.

Genetic Traits and Probability

The inheritance of hair color and texture is determined by multiple genes, making it a complex genetic trait. However, for the purpose of this question, we can simplify the analysis by focusing on a single gene pair for each trait.

- Hair Color: Let's assume that dark hair is dominant (represented by "D") and light hair is recessive (represented by "d"). - Hair Texture: Wavy hair is dominant (represented by "W"), and straight hair is recessive (represented by "w").

Predicting Offspring's Hair Traits

Based on the given information, we can use Punnett squares to predict the potential combinations of hair traits in the offspring.

1. The father's genotype for hair color and texture can be represented as "DDWW" (dark and wavy). 2. The mother's genotype for hair color and texture can be represented as "ddww" (light and straight).

Punnett Square Analysis

When we cross the father's and mother's genotypes, we can determine the potential genotypes and phenotypes of the offspring.

- The possible genotypes of the offspring are: "DdWw", "Ddww", "ddWw", "ddww". - The corresponding phenotypes are: 50% dark hair, 50% light hair; 50% wavy hair, 50% straight hair.

Conclusion

Based on the principles of genetic inheritance and the given parental traits, the potential hair traits of the children would be: 50% light hair (from the mother) and 50% dark hair (from the father), and 50% straight hair (from the mother) and 50% wavy hair (from the father). Therefore, the correct option would be: 1) 50% light wavy, 50% dark straight hair.