Question

. У кошек черная окраска шерсти доминирует над рыжей, а короткошерстность - над длинношерстностью. Обе пары генов аутосомные не сцепленные между собой. В потомстве черной длинношерстной кошки и черного короткошерстного кота оказались черные длинношерстные и рыжие короткошерстные котята. Установите генотипы родителей и вероятность рождения котят с различными фенотипами у данной пары животных

Answer 1

Установила генотипы родителей и вероятность рождения котят с различными фенотипами у данной пары животных.

Answer 2

Understanding the Question

The question is asking about the inheritance patterns of coat color and coat length in cats. Specifically, it mentions that black coat color is dominant over red (ginger) coat color, and short hair is dominant over long hair. The question also provides information about the genotypes of the parents and asks for the genotypes and probabilities of different phenotypes in the offspring.

Coat Color Inheritance

In cats, coat color is determined by multiple genes, but for the purpose of this question, we will focus on the interaction between the black (B) and red (b) alleles. The black allele is dominant over the red allele, so a cat with at least one black allele will have black coat color.

Based on the information given, we know that the black long-haired cat (BL) has the genotype Bb and the black short-haired cat (BS) has the genotype BB. We can represent the genotypes of the parents as follows:

- Black long-haired cat (BL): Bb - Black short-haired cat (BS): BB

Coat Length Inheritance

Coat length in cats is also determined by multiple genes, but for the purpose of this question, we will focus on the interaction between the short hair (S) and long hair (s) alleles. The short hair allele is dominant over the long hair allele, so a cat with at least one short hair allele will have short hair.

Based on the information given, we know that the black long-haired cat (BL) has the genotype Bb and the black short-haired cat (BS) has the genotype BB. We can represent the genotypes of the parents as follows:

- Black long-haired cat (BL): Bb - Black short-haired cat (BS): BB

Offspring Genotypes and Phenotypes

To determine the genotypes and phenotypes of the offspring, we need to consider the possible combinations of alleles from the parents.

The possible genotypes for the offspring are as follows:

- Black long-haired kitten (BL): Bb (inherited from the black long-haired parent) - Black short-haired kitten (BS): BB (inherited from the black short-haired parent) - Red long-haired kitten (RL): bb (inherited from both parents) - Red short-haired kitten (RS): bb (inherited from both parents)

Based on these genotypes, we can determine the phenotypes of the kittens:

- Black long-haired kitten (BL): black long-haired - Black short-haired kitten (BS): black short-haired - Red long-haired kitten (RL): red long-haired - Red short-haired kitten (RS): red short-haired

Probability of Different Phenotypes

To calculate the probability of each phenotype, we need to consider the possible combinations of alleles from the parents.

Since the black long-haired cat (BL) has the genotype Bb and the black short-haired cat (BS) has the genotype BB, the possible combinations of alleles in the offspring are as follows:

- Black long-haired kitten (BL): Bb (25% probability) - Black short-haired kitten (BS): BB (25% probability) - Red long-haired kitten (RL): bb (25% probability) - Red short-haired kitten (RS): bb (25% probability)

Therefore, each phenotype has an equal probability of 25% in the offspring.

Summary

In summary, the genotypes of the parents are as follows:

- Black long-haired cat (BL): Bb - Black short-haired cat (BS): BB

The possible genotypes and phenotypes of the offspring are as follows:

- Black long-haired kitten (BL): Bb (25% probability) - black long-haired - Black short-haired kitten (BS): BB (25% probability) - black short-haired - Red long-haired kitten (RL): bb (25% probability) - red long-haired - Red short-haired kitten (RS): bb (25% probability) - red short-haired

Please note that the probabilities mentioned are based on the assumption that the parents are heterozygous for coat color and homozygous for coat length.