Mon 8 Feb, 2016 03:29 pm
Suppose we have a Mum who is homozygous recessive (aa) in some gene, and a Dad about whom we know nothing. They have 3 children: 2 twins (a boy and a girl), and another boy. All three children have (aa) in that gene. Does the fact that both the boy and the girl are (aa) mean that Dad is also (aa)?