The significance of meiosis Grade 12 Life Sciences Notes with Activities Questions and Answers Meiosis, the process of cell division crucial for sexual reproduction, is a fundamental concept in biology. In Grade 12 Life Sciences, understanding meiosis is paramount, as it forms the basis for comprehending genetic inheritance, variation, and evolutionary processes. This Page aims to provide comprehensive notes, activities, questions, and answers to help students grasp the significance of meiosis.

Notes

There are two reasons why meiosis is important.

1. It reduces the number of chromosomes by half, in other words from diploid to haploid. This ensures that sex cells have half the number of chromosomes of other somatic cells so that when fertilisation occurs the zygote formed has the correct number of chromosomes. It balances the doubling effect of fertilisation.
2. Crossing over introduces genetic variation. Genetic variation results in offspring that are better adapted to a particular environment and ensures that they will have a better chance of survival.

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