Question

У собак короткая шерсть доминирует над длинной. Охотник купил собаку с короткой шерстью и хочет быть уверен , что она не несет генов длинной шерсти. Какого партнера по фенотипу и генотипу надо подобрать для скрещивания, чтобы проверить проверить генотип купленной собаки? составьте схему скрещивания Какой должен быть результат, если собака чистоплодная? пожалуй интересная задача

Answer 1

This is an interesting question indeed. Let me try to answer it in detail.

The problem is about the inheritance of coat length in dogs. Coat length is determined by a single gene with two alleles: L for short coat and l for long coat. Short coat is dominant over long coat, which means that a dog with LL or Ll genotype will have a short coat, while a dog with ll genotype will have a long coat.

The hunter bought a dog with a short coat and wants to be sure that it does not carry the genes for long coat. To do this, he needs to find a partner for the dog that has a long coat and a known genotype of ll. This is called a test cross, which is a way of determining the genotype of an individual with a dominant phenotype by crossing it with an individual with a recessive phenotype.

The scheme of the test cross is as follows:

| Parent 1 (short coat) | LL or Ll | x | Parent 2 (long coat) | ll | | --- | --- | --- | --- | --- | | Gametes | L or l | | Gametes | l | | Offspring | Ll or ll | | Offspring | short or long coat |

The result of the test cross will depend on the genotype of the dog with a short coat. If the dog is homozygous dominant (LL), then all the offspring will have a short coat and a heterozygous genotype (Ll). This means that the dog does not carry the genes for long coat. If the dog is heterozygous (Ll), then half of the offspring will have a short coat and a heterozygous genotype (Ll), and the other half will have a long coat and a homozygous recessive genotype (ll). This means that the dog does carry the genes for long coat.

I hope this answer helps you understand the problem better. If you want to learn more about genetics and inheritance, you can check out some of the web search results I found for you . Have a nice day!