Suppose in humans an autosomal gene, a, causes dwarfism in one homozygous state (aa), normal height in the heterozygous state (aa-), and is embryonic lethal in the other homozygous state (a-a-). A separate gene, p, found on another chromosome causes albinism, an autosomal recessive disorder. Albino individuals have the pp genotype. Rick and Lori, who are both heterozygous for both genes (aa- pp-), just had a son, Carl. What is the probability that Carl is of normal height with albinism?