Question

(ii) describe a method to determine the genotype of a pea plant with blue flowers.

Explanation:

Identify the genetic problem

Using the Heterozygous Genotype knowledge point
To determine the unknown genotype of an organism displaying a dominant phenotype (blue flowers), we must identify if it is homozygous dominant or heterozygous.

Describe the test cross method

Cross the pea plant having blue flowers with a homozygous recessive plant (which has the recessive flower color, typically white).

Analyze the offspring outcomes

If any offspring show the recessive phenotype, the parent is heterozygous; if all offspring show the dominant phenotype, the parent is homozygous dominant.

Answer:

Cross the blue-flowered pea plant with a homozygous recessive (white-flowered) pea plant and observe the phenotypes of the offspring.