Question

g the inability to metabolize phenylalanine is a recessive autosomal trait called PKU when A marries a woman at random from another town what is the probability that his first born will be affected by PKU

Answer 1

The correct answer is - zero percent.

Step-by-step explanation:

As it is known that PKU is a disease that takes place if one has wild type recessive rr only. It is given that A is normal heterozygous and if he marries normal women then

R r

R RR Rr

R RR Rr

so there will be 2 carriers and 2 unaffected but no affected.