(a) Fig. 7.1 shows a section through a fruit. [Figure 7.1] The seed and the fruit wall are genetically different. Explain how this difference is produced.

Mark scheme

Marking points from the official mark scheme (May/June 2017). The mark or mark type is shown in brackets.

1. [4] (a) (seed) 1 seed + results from fertilisation AW / sexual reproduction; 2 (fusion / fertilisation of) gametes OR pollen nucleus + egg / ovum / ovule ; 3 reference to (gametes often) from different plants / flowers ; 4 (gametes produced by) meiosis / reduction division ; 5 combination AW of (different) genes / alleles ; (fruit) 6 fruit (wall) + results from mitosis; 7 reference to (genetically) identical / clones ;
2. [6] (b) (wind) (animal) 1 small OR large ; 2 light / buoyant OR heavy ; 3 wings / parachutes OR hooks / hairs ; 4 large surface area OR attachment (to animal) ; 5 large number OR small number ; 6 not coloured / dull OR colour / named colour / bright ; 7 not sweet / juicy / flesh(y) / scented OR sweet / juicy / flesh(y) / scented ; 8 reference to food / eaten / digested ; 9 seed + enzyme resistant / cannot be digested / is egested / is lost in faeces / is thrown away ;