LARI 2 3 4 5 6 7 8 9 Topic 2: Inheritance (cont.)
normal male
normale
with so
O with
b) (ii) The geneticist crossed dog 4 with dog 5. Approximately half the offspring
had acatalasia and half the offspring did not. Complete the genetic diagram to
show how this is possible. The normal allele is represented by B and the mutant allele is
represented by b. [3 marks]
Dog 4
Dog 5
Parental phenotypes
normal
acatalasia
Parental genotypes
Offspring genotypes
Offspring phenotypes