With regard to twins, monozygotic is to dizygotic as a. common ...

[bobbie]

With regard to twins, monozygotic is to dizygotic as
 
  a. common is to uncommon.
  b. one egg is to two eggs.
  c. nonshared environment is to shared environment.
  d. fraternal is to identical.

Question 2

While Click and Clack are brothers and look somewhat alike, they have only about 50 percent of their genes in common. This would mean that Click and Clack are most likely
 
  a. identical twins.
  b. conjoined twins.
  c. fraternal twins.
  d. adopted.

[bd5255]

Answer to Question 1

b

Answer to Question 2

c