Question

У человека белая прядь волос и карие глаза являются доминантными признаками, а отсутствие белой пряди и серые глаза – рецессивные признаки. Кареглазый юноша без белой пряди женился на сероглазой девушке, которая имела белую прядь и была гетерозиготной по этому признаку. У матери юноши были серые глаза. Какие могут быть их дети? Желательно с таблицей

Answer 1

Ответ:

Дано:

A - наличие седой пряди волос;

a - отсутствие седой пряди волос;

Найти:

P - ?

F1 - ?

Решение

1 вариант:

P: АА х аа

G: Аа Аа Аа Аа

F1: Аа - 100% наличие седой пряди волос.

2 вариант:

P: Аа х аа

G: Аа аа Аа аа

F1: Аа аа - 50% наличие седой пряди волос, 50% её отсутствие.

Ответ: генотип матери АА или Аа, отца - аа, детей - Аа или аа.

Объяснение:

Answer 2

Inheritance of Hair Color and Eye Color

In this scenario, the individual has a white streak of hair and brown eyes, which are considered dominant traits. The absence of a white streak and gray eyes are considered recessive traits. The young man with brown eyes and no white streak of hair married a gray-eyed girl who had a white streak of hair and was heterozygous for this trait. The young man's mother had gray eyes.

To determine the possible traits of their children, we can use Punnett squares to visualize the inheritance patterns. A Punnett square is a diagram that helps predict the possible combinations of alleles (gene variants) that offspring can inherit from their parents.

Let's assign the following symbols for the traits: - White streak of hair (W) is dominant, and its absence (w) is recessive. - Brown eyes (B) are dominant, and gray eyes (b) are recessive.

Punnett Square for Hair Color

| | W | w | |----------|-------------|-------------| | W | WW (white streak) | Ww (white streak) | | w | Ww (white streak) | ww (no white streak) |

According to the given information, the young man does not have a white streak of hair, so his genotype is ww. The young woman is heterozygous for the white streak of hair, so her genotype is Ww.

By crossing these genotypes, we can determine the possible genotypes and phenotypes of their children. The genotypes are represented by the letters in the Punnett square, and the phenotypes are the observable traits.

Based on the Punnett square, the possible genotypes and phenotypes of their children for hair color are as follows:

- 50% chance of having the genotype Ww and phenotype white streak of hair. - 50% chance of having the genotype ww and phenotype no white streak of hair.

Punnett Square for Eye Color

| | B | b | |----------|-------------|-------------| | B | BB (brown eyes) | Bb (brown eyes) | | b | Bb (brown eyes) | bb (gray eyes) |

According to the given information, the young man has brown eyes, so his genotype is BB. The young woman has gray eyes, so her genotype is bb.

By crossing these genotypes, we can determine the possible genotypes and phenotypes of their children for eye color.

Based on the Punnett square, the possible genotypes and phenotypes of their children for eye color are as follows:

- 100% chance of having the genotype Bb and phenotype brown eyes.

Summary of Possible Traits

Based on the Punnett squares, the possible traits of their children are as follows:

- 50% chance of having a white streak of hair and brown eyes. - 50% chance of having no white streak of hair and brown eyes.

It's important to note that these are the predicted probabilities based on Mendelian genetics and the given information. In reality, there can be variations and other factors that influence the expression of traits.

I hope this explanation helps! Let me know if you have any further questions.