Question

Рыжеволосая девушка выходит замуж за мужчину с не ры жими волосами, гомозиготного по этому признаку. Какова вероят ность рождения от этого брака ребенка с не рыжими волосами, если известно, что рыжие волосы - рецессивный признак?

Answer 1

a-рыжий
А-нерыжий

P: аа    х     АА
G : a            A
F1: Aa
100% шанс рождения нерыжеволосого ребенка

Answer 2

The Probability of Having a Child with Non-Red Hair

To calculate the probability of having a child with non-red hair in this scenario, we need to consider the genetic inheritance of hair color. Red hair is considered a recessive trait, meaning that it is only expressed when an individual inherits two copies of the gene for red hair (one from each parent). Non-red hair, on the other hand, can be either dominant or recessive.

In this case, the red-haired girl is marrying a man without red hair, who is homozygous (having two identical copies) for non-red hair. This means that he does not carry the gene for red hair. Since red hair is a recessive trait, the girl must be heterozygous (carrying one copy of the gene for red hair and one copy for non-red hair) in order to have red hair.

Based on this information, we can use a Punnett square to determine the probability of their child having non-red hair:

| | Non-Red Hair (NN) | Red Hair (Nn) | |----------|------------------|---------------| | Red Hair (Nn) | 100% | 0% | | Non-Red Hair (NN) | 100% | 0% |

From the Punnett square, we can see that there is a 100% chance that their child will have non-red hair. This is because both parents do not carry the gene for red hair, and therefore cannot pass it on to their child.

In summary, the probability of their child having non-red hair is 100%.