Consider a Trait Determined by a Rare, Simple Mendelian, Autosomal

Multiple Choice

Consider a trait determined by a rare, simple Mendelian, autosomal recessive allele. What is the concordance between identical twins? Between same-sex fraternal twins?

A) identical concordance = 1; fraternal concordance = 0.071
B) identical concordance = 1; fraternal concordance = 0.143
C) identical concordance = 1; fraternal concordance = 0.250
D) identical concordance = 1; fraternal concordance = 0.333
E) identical concordance = 1; fraternal concordance = 0.500