Question

У человека карий цвет глаз полностью доминирует над голубым. Возможно ли рождение голубоглазого ребенка в семье, где оба родителя кареглазые? Если возможно, то в каком случае и с какой вераятностью ? Если невозможно , то почему?

Answer 1

Да, возможно, если оба родителя будут гетерозиготны по данному признаку. В доказательство проведем скрещивание

♂Аа х ♀Аа = АА - карий цвет, 2 Аа - карий цвет, аа - голубой цвет.

С вероятностью 25% в этой семье будет голубоглазый ребенок.

Answer 2

Вероятность 25 %, что ребёнок будет голубоглазым)

Answer 3

Possibility of a Blue-Eyed Child in a Family with Both Parents Having Brown Eyes

The inheritance of eye color is a complex genetic trait influenced by multiple genes. While it is generally true that brown eye color is dominant over blue eye color, there is still a possibility for a blue-eyed child to be born in a family where both parents have brown eyes. This is because eye color is determined by the interaction of multiple genes, and the expression of these genes can vary.

The specific genes involved in eye color inheritance are not fully understood, but it is believed that variations in the OCA2 and HERC2 genes play a significant role. These genes are involved in the production and distribution of melanin, the pigment that gives color to the eyes, hair, and skin.

Inheritance of Eye Color: Eye color inheritance is a complex process that involves the interaction of multiple genes. While the exact mechanisms are not fully understood, it is generally believed that variations in the OCA2 and HERC2 genes are important factors in determining eye color.

Dominance of Brown Eye Color: Brown eye color is generally considered dominant over blue eye color. This means that if one parent has brown eyes and the other has blue eyes, their children are more likely to have brown eyes. However, this is not always the case, as other genetic factors can influence the expression of eye color.

Variability in Eye Color Expression: Eye color is not solely determined by a single gene, but rather by the interaction of multiple genes. This can lead to variability in eye color expression, even in families where both parents have brown eyes. It is possible for the parents to carry genetic variations that can result in the birth of a blue-eyed child.

Probability of a Blue-Eyed Child: The probability of a blue-eyed child being born in a family where both parents have brown eyes depends on the specific genetic makeup of the parents. Without knowing the specific genetic variations present in the parents, it is difficult to determine the exact probability. However, it is generally considered less likely for a blue-eyed child to be born in such a family, but it is still possible.

In conclusion, while brown eye color is generally dominant over blue eye color, there is still a possibility for a blue-eyed child to be born in a family where both parents have brown eyes. This is due to the complex nature of eye color inheritance, which involves the interaction of multiple genes. The probability of a blue-eyed child being born in such a family depends on the specific genetic variations present in the parents.