The hunter bought a dog that has short hair. It is important for him to know that she is purebred. What actions will help the hunter to determine that his dog does not carry recessive genes – long hair? Make a scheme for solving the problem and determine the ratio of the genotypes of the offspring obtained from crossing a purebred dog with a heterozygous one.
He can get offspring from his dog, for which he needs to pick up a partner who has long hair (aa). If all the puppies in the offspring are short-haired, then the purchased dog is purebred (AA), and if some puppies in the litter are short-haired and others with long-haired, then this dog’s genotype contains genes for recessive long hair (Aa). Parents of Aa with short hair (gametes A, a), AA with short hair (gametes A) – the ratio of genotypes in the offspring will be 1Aa: 1 AA.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.