Edexcel OLevel Biology revision notes

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Lesson

Lesson-3.2.18- know that in human cells the diploid number of chromosomes is 46 and the haploid number is 23.

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Lesson-3.2.17- understand how random fertilisation produces genetic variation of offspring.Previous Lesson-3.2.19- understand that variation within a species can be genetic, environmental, or a combination of both.Next