Mendelian Genetics Practice Test

A genetic counselor is analyzing a pedigree for a rare genetic condition. Two unaffected parents have a child who is affected by the condition.

In a species of plant, the allele for tall stems ($$T$$) is dominant to short stems ($$t$$), and the allele for red flowers ($$R$$) is dominant to white flowers ($$r$$). The genes for stem height and flower color are on different chromosomes.