Define homozygous and haploid. Explain incomplete dominance in Mendel's pea plants using alleles R and W for red and white flowers.

JUNE 2013 SECTION B

6. a) Define the following terms: i) Homozygous: An individual having two identical alleles for a particular gene (e.g., BB or bb). ii) Haploid: A cell or organism having a single set of unpaired chromosomes (n), typically found in gametes.

   b) When Mendel crossed pure breeding red-flowered pea plants with pure breeding white-flowered pea plant, all the members of the F1 generation had pink flowers. This indicates incomplete dominance.
   Let R = allele for red flowers
   Let W = allele for white flowers

   Parental Genotypes: Pure breeding red (RR) $\times