Autosomal Dominant Disease: Use these genotypic symbols of an autosomal dominant disease:

Normal (do not have the trait) = nn

Affected (shows the trait) = NN or Nn

If a heterozygous (different alleles: Nn) male marries a heterozygous female; what are the chances of a child being born with the trait?

If a homozygous (nn) male marries a homozygous female (NN); what are the chances of a child being born with the trait?