1.Differentiate a chromosomal disorder from a singlegene disorder. 2. At which stage of pregnancy does the highest risk of central nervous system damage occur? 3. State five substances that are...

1.Differentiate a chromosomal disorder from a singlegene disorder.

2. At which stage of pregnancy does the highest risk of central nervous system damage occur?

3. State five substances that are thought to be teratogenic.

4. Why is it safest to avoid contact with any possible teratogenic substance during the childbearing years?