Question

Охотник купил щенка, по отзыву продавца породистого – чёрного(А) и короткошёрстого(В). Охотник хочет убедиться, что его не обманули и в генотипе собаки нет генов « вырождения» - кофейного цвета (а) и длинной шерсти (в). Дайте рекомендацию охотнику. Докажите в форме решения задачи.

Answer 1

Ему стоит провести анализируюшее скрещивание с собакой кофейного цвета и длинной шерстью (дигомозигота по рецессиву). Если все поколение будет единообразным (чёрным и короткошерстым), то значит его не обманули:
ААВВ×аавв
G: AВ aв
AаВв
Если поколение не будет единообразным, то его обманули:
АаВв×аавв
G:Aв АВ ав аВ ав
F1: Aaвв:аавв:АаВв:ааВв

Answer 2

Background Information

The hunter purchased a puppy based on the seller's claim that it is a purebred dog, specifically a black (A) and short-haired (B) one. The hunter wants to verify that he has not been deceived and that the dog's genotype does not contain genes for "degeneracy" - coffee color (a) and long hair (b). The hunter is seeking a recommendation and a solution to this problem.

Recommendation

To determine the genotype of the puppy and verify if it carries the genes for coffee color and long hair, the hunter should consider performing a DNA test on the dog. A DNA test can provide accurate information about the dog's genetic makeup and confirm its breed and characteristics.

Solution

To solve this problem, the hunter can follow these steps:

1. Find a reputable veterinary clinic or laboratory that offers DNA testing services for dogs. It is important to choose a reliable provider to ensure accurate results.

2. Contact the chosen clinic or laboratory and inquire about their DNA testing process for dogs. Ask about the specific tests they offer and if they can determine the presence of genes for coffee color and long hair.

3. Schedule an appointment or send a sample of the dog's DNA to the clinic or laboratory as per their instructions. The DNA sample can be obtained through a simple cheek swab or a blood sample.

4. Wait for the results. The clinic or laboratory will analyze the DNA sample and provide a detailed report on the dog's genetic makeup, including information about its breed, color genes, and coat length genes.

5. Review the results. If the report confirms that the dog does not carry the genes for coffee color (a) and long hair (b), the hunter can be assured that he has not been deceived and that the dog is indeed a purebred black (A) and short-haired (B) dog.

6. If the report indicates the presence of the genes for coffee color (a) and/or long hair (b), the hunter may need to reconsider the dog's breed or consult with a veterinarian or a professional dog breeder for further guidance.

Conclusion

Performing a DNA test on the puppy is the most reliable way for the hunter to verify its genetic makeup and confirm if it carries the genes for coffee color and long hair. By following the recommended steps and obtaining the DNA test results, the hunter can make an informed decision about the dog's breed and characteristics.