Final answer:
Mendel's Law of Segregation states that paired unit factors (genes) must segregate equally into gametes. To test this law, the experimenter needs a minimum of two contrasting forms of a gene.
Step-by-step explanation:
The subject of this question is Biology. Mendel's Law of Segregation states that paired unit factors (genes) must segregate equally into gametes such that offspring have an equal likelihood of inheriting either factor. To test Mendel's Law of Segregation, the experimenter needs a minimum of two contrasting forms of a gene. This is because the law is based on the observation of true-breeding pea plants with contrasting traits.