Q20 of 85 Page 286

Give the role of genes in evolution.

Evolution is a result of a change in the genetic material from generation to generation. These changes can occur in many ways, one of which can be a mutation.

Mutations are the random changes in the genetic codes of an organism. No genes mean no mutations and no mutations means no evolution. Hence, genes are very important in the process of evolution.


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(i) A gene can express more than one trait. What gives rise to different expressions?

(ii) When a true breeding pea plant which has yellow seeds is pollinated by a plant that has green seeds, all the F 1 plants have yellow seeds. What might have been the allele for yellow seeds (tell whether it was dominant or recessive / heterozygous or homozygous )?