in humans, having freckles is dominant over not having freckles. A heterozygous male with freckles has children with a female who does not have freckles. What fraction/percent of the children will not have freckles?
If you do out the punnet square Ffxff, the result will be 50% of offspring with heterozygous (dominant trait is shown) and 50% will be homozygous recessive