This question was the least popular question in this section and many candidates avoided it. Those who attempted it did not do very well, manifesting candidates' aversion for genetics. Some candidates however had very high scores on the question.

Most candidates performed fairly well on the defmition of terms but did not do well in the genetic diagram. They would not correctly express the genotypes of the parents and so this affected the results. .
Some candidates wrote the genotypes of the parents as Tt and IT rather than X^By and X^BX^b• The
expected answers include:

Parental Phenotype                             Normal                                                         Carrier
                                                                   Male                               X                           Female

Parental genotype                                         X^By                         X                         X^BX^b

Gametes

                                                                        F1 Genotype

F 1 Phenotype                                                   Normal   normal                    Carrier       colour blind
                                                                             female   male                         female        male                    

Most candidates could properly outline Larmack's theory of evolution but some candidates omitted to state that new characters acquired are passed on to offspring which gives rise to new species.