Question

Задача №1.У каракульской овцы черная окраска шерсти является рецессивным признаком по отношению к серой окраске. От скрещивания черных и серых животных получили 96 гибридов. Гибриды скрещивались между собой, и во втором поколении было получено 48 ягнят.Сколько гетерозиготных животных среди гибридов в первом поколении?Сколько разных генотипов среди гибридов второго поколения?Сколько разных фенотипов среди гибридов второго поколения?Сколько будет серых животных во втором поколении?Сколько будет черных животных во втором поколении?

Answer 1

А- серая окраска      Р: АА х аа
а -чёрная окраска    G: А  А  а  а
                                     F1: Аа Аа Аа Аа
Р2: Аа х Аа
G: А  а  А  а
F2: АА Аа Аа аа
96 гетерозиготных особей в первом поколении. 3 разных генотипа среди гибридов 2 поколения. 2 разных фенотипа среди гибридов 2 поколения. 36 серых животных. 12 чёрных.
Не забудь поставить значки женской и мужской особей в Р1 и Р2

Answer 2

Task 1: Inheritance of Coat Color in Karakul Sheep

In Karakul sheep, black coat color is a recessive trait compared to gray coat color. When black and gray animals are crossed, 96 hybrids are obtained. These hybrids are then crossed with each other, resulting in 48 lambs in the second generation.

To solve this problem, we need to determine the number of heterozygous animals among the hybrids in the first generation, the number of different genotypes among the hybrids in the second generation, the number of different phenotypes among the hybrids in the second generation, the number of gray animals in the second generation, and the number of black animals in the second generation.

Solution:

1. Number of heterozygous animals among the hybrids in the first generation: - The first generation hybrids are obtained by crossing black and gray animals. - Let's assume that the black coat color is represented by the genotype "bb" (homozygous recessive) and the gray coat color is represented by the genotype "BB" (homozygous dominant). - The hybrids in the first generation will have the genotype "Bb" (heterozygous). - The number of hybrids in the first generation is given as 96. - Therefore, the number of heterozygous animals among the hybrids in the first generation is 96.

2. Number of different genotypes among the hybrids in the second generation: - The second generation hybrids are obtained by crossing the hybrids from the first generation. - In the first generation, all the hybrids have the genotype "Bb" (heterozygous). - When these hybrids are crossed with each other, the possible genotypes in the second generation are: "BB" (gray), "Bb" (gray), and "bb" (black). - The number of different genotypes among the hybrids in the second generation is 3.

3. Number of different phenotypes among the hybrids in the second generation: - The phenotypes in the second generation are determined by the genotypes. - In the second generation, the possible phenotypes are: gray (BB or Bb) and black (bb). - The number of different phenotypes among the hybrids in the second generation is 2.

4. Number of gray animals in the second generation: - The gray phenotype can be determined by the genotypes "BB" and "Bb". - In the second generation, the possible genotypes are: "BB" (gray) and "Bb" (gray). - The number of gray animals in the second generation is 48.

5. Number of black animals in the second generation: - The black phenotype can be determined by the genotype "bb". - In the second generation, the possible genotype is "bb" (black). - The number of black animals in the second generation is 0.

Therefore, in the second generation, there are 48 gray animals and 0 black animals.

Please let me know if you need any further clarification or assistance!