autosomal recessive
Pedigree analysis of a autosomal recessive trait

The affected children are offspring of two heterozygous parents, who are first cousins [note the double bar indicating consanguinity]. The parents have each inherited the allele from one of the grandparents.

Homework: Write out the genotypes of every individual in the tree.

Figure ©2002 by Griffiths et al;. all text material ©2016 by Steven M. Carr