Um, not sure. Depends how in depth you went in to them all. I only did three as well (tyranase in siamese cats, BB/Bb/bb brown/blue eyes and roan cattle), but i wrote a whole page in midget writing.
You basically also had to talk about how variation can lead to a recombination of genes aka a different combination of alleles = different genotype = different phenotype, thus "unexpected results".
I spoke about: Mutations, Sexual reproduction - basically the genetic info from two different organisms is combined, the variation which arises from crossing over, the random segregation of chromosomes and the random assortment of chromosomes. All these process resulted in the increased chance that a child would have a different phenotype to its parents.
I then spoke about, dominant and recessive alleles and how both parents could be heterozygous and thus the child could be homozygous recessive (Mendel's 3 : 1 ratio). And of course you could go into other things like Co-Dominance etc.
The environment, I simply brought up the example of the Mung bean experiement we did in class where the mung beans not exposed to sunlight where unable to produce enough sugars through photosynthesis and thus could not grow to potential. Thus, their phenotype was different due to environmental factors. I then spoke about under nourishment and how a child for example might not be able to grow to his full potential if undernourished e.g underfed.
