Question

У мышей серый цвет шерсти доминирует над коричневым. Какое потомство будет у коричневой самки и гетерозиготного самца?

Answer 1

Дано:
А-серый цвет;
а-коричневый цвет;
Найти:F1
Решение:
P: самец(Aa) x самка(aa)
G:самец(A,a);самка(a);
F1:Aa-серые мыши;
     aa-коричневые мыши;
Ответ:(Aa)-серые,(aa)-коричневые.

Answer 2

Understanding the Genetics of Coat Color in Mice

In mice, the color of the coat is determined by genetic factors. The specific genes responsible for coat color in mice are the Agouti signaling protein (ASIP) gene and the melanocortin 1 receptor (MC1R) gene. These genes come in different forms, known as alleles, and the combination of alleles inherited from the parents determines the coat color of the offspring.

Coat Color Inheritance in Mice

- Dominant and Recessive Alleles: In mice, the gray color of the coat is often dominant over the brown color. This means that if a mouse has one allele for gray coat color (G) and one allele for brown coat color (g), the gray allele will determine the coat color because it is dominant over the brown allele.

- Heterozygous and Homozygous: A heterozygous individual has two different alleles for a particular gene, while a homozygous individual has two identical alleles for a particular gene.

Predicting the Offspring's Coat Color

When a brown-coated female mouse (gg) mates with a heterozygous gray-coated male mouse (Gg), the offspring's coat color can be predicted using Punnett squares, a visual representation of the possible genetic combinations.

- The Punnett square for this cross would show that there is a 50% chance of the offspring having gray coat color (Gg) and a 50% chance of the offspring having brown coat color (gg).

- This means that on average, half of the offspring will have gray coat color and the other half will have brown coat color.

Conclusion

In summary, when a brown-coated female mouse (gg) mates with a heterozygous gray-coated male mouse (Gg), the predicted offspring will have a 50% chance of having gray coat color (Gg) and a 50% chance of having brown coat color (gg) based on the principles of genetic inheritance in mice.