Pku and albinism are two autosomal recessive disorders, unlinked in human beings. if couple each of them heterozygous for both traits, produce a child, what is the chance of their having a child with (a)pku (b)albinism (c)both traits?

a) 3/16; b) 3/16; c) 1/16

Explanation:

PKU and albinism are two autosomal recessive disorders. The possible genotypes and phenotypes for each disease are:

PKU

Albinism

If a couple of individuals heterozygous for both genes (PpAa) has offspring, from the Punnett Square we get the chances of them having:

ppA_: 3/16

P_aa: 3/16

ppaa: 1/16

the answer is b: 1.4 km/hr