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 |