Читать книгу Pet-Specific Care for the Veterinary Team - Группа авторов - Страница 228

If you have a breeding animal that has superior attributes (phenes) but inadvertently carries a recessive trait that is not clinically evident even to the trained eye (genes are read in pairs, and if one of those pairs reflects a recessive trait, then the trait will not be displayed), then the pet may be bred intensively. If that recessive trait is not present in the other breeding stock, all the offspring (F1 generation) will appear clinically (phenotypically) normal, but some of the offspring will still carry that recessive trait. If that generation is bred to unrelated stock, all the next generation (F2) will also be phenotypically normal, with even a smaller percentage being carriers. If bred to related stock that also carry the mutation, however, the recessive trait will begin to be concentrated and manifested.