Choose true or false for the following statements regarding human genetic diseases. 1. Genetic diseases are spread by shared environmental conditions. True/False 2. Genetic disorders are more common in families with one affected member as compared to the general population. True/False 3. Both members of identical and fraternal twin pairs have the same likelihood of expressing the same genetic disease. True/False 4. Genetic diseases occur at the same rate in all human populations. True/False5. Most genetic diseases have a specific age of onset. True/False6. Many human and animal genetic disorders share similar characteristics. True/False