What are the causes of genetic abnormalities?
Top Genetic defects usually show what is called recessive inheritance. A parent can carry the defective gene and appear normal; the parent is then known as a carrier. If both parents pass the defective gene to the offspring, the genetic defect shows up and the genetic condition in the offspring is called homozygous recessive. The defective gene in the carrier animal is present along with the normal gene and this condition is termed heterozygous. The underlying problem of genetic defects is that parents that appear to be perfectly normal can be carriers and so can produce offspring that are defective. Parents that never produce defective progeny are in the majority and are called homozygous normal. At first glance it seems that if we could identify carrier animals and eliminate them from the breeding population the problem of recessive genetic defects would be solved. However, it is necessary to explore the problem a little further before deciding that identifying carriers is necessaril
