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The significance of meiosis Grade 12 Life Sciences Notes with Activities Questions and Answers

The significance of meiosis Grade 12 Life Sciences Notes with Activities Questions and Answers You may discover grade 12 students’ revision activities with questions and answers for the topic of meiosis on this page. These activities will help students get ready for their tests and exams.

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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