Problem
Briefly describe each of the following human diseases or traits, and explain the mode of inheritance:
i. sickle cell disease (SC)
ii. Huntington's disease (HD),
iii. X-linked color blindness,
iv. X-linked hypertrichosis,
v. freckles and widow's peak,
vi. Cystic fibrosis (CF), Phenylketonuria (PKU), and Marfan syndrome.