Modern pedigree cat breeds, such as the Persian or Siamese, have been developed through many generations of selective breeding. Which option does not explain why genetic disorders and health problems are common in pedigree cats?
Features that are selected to be desirable to humans can be linked to traits that are harmful to the cats' well-being.
Selective breeding increases the rate at which new, harmful DNA mutations occur in the gene pool.
Selective breeding reduces genetic variation, increasing the probability of individuals inheriting two copies of a harmful recessive allele.
Selective breeding often involves mating closely related individuals, which can lead to inbreeding depression.
32 exam-style questions on OCR A A Level Biology Patterns of inheritance. Each one has a worked solution and a mark scheme showing where the marks go.