1. Twins from one fertilized egg are called
a) monozygotic twins
b) dyzogitic twins
c) identical twins
d) fraternal twins
e) both a and c
2. Explain what alleles are.
3. If both parents are CARRIERS for a recessive genetic defect,
what is the probability that the baby they are expecting will have that
defect?
a) 25%
b) 0%
c) 50%
d) 100%
4. The active substance of genes, which governs the heredity of all
life is
a) hormones
b)enzymes
c) DNA
d) proteins
5. Bill's father and sister both have achondroplasia (dwarfism), a dominant
genetic characteristic. Bill and his wife are both of normal height. All
of their children will be normal height. Explain how we know this is true.