(a) Define the following terms as used in genetics: (i) Genotype (ii) Phenotype (iii) Codominance (iv) Test cross (b) In cattle, the gene for red coat (R) is incompletely dominant over the gene for white coat (r). A farmer crosses a red-coated bull with a white-coated cow. (i) State the genotypes of the parents. (ii) Using a genetic diagram, show the genotypes and phenotypes of the F1 offspring. (iii) If two F1 offspring are crossed, what proportion of the F2 generation will be red-coated? Show your working. (c) State TWO differences between continuous variation and discontinuous variation.