In humans, the presence of freckles is a dominant trait, and their absence is a recessive trait. The eyebrow shape is also a genetically inherited trait, with separated eyebrows being dominant and joined eyebrows being recessive. In a couple, the woman has freckles and separated eyebrows, and she is heterozygous for both traits. The man does not have freckles but he has joined eyebrows. What is the probability that their offspring has freckles and separated eyebrows? Draw the tree diagram or Punnett square to justify your answer.