Question

In human curly hair is dominant over straight hair a woman heterozygous for hair curl marries a man with straight hair and they have four children?

Answer 1

50% chance for homozygous straight haired, 50% chance for heterozygous curly haired. 
Punnett square:

        C        c
c |   Cc  T  cc    |
   | -----  +  -----  |
c |   Cc  |   cc    |