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However, sometimes the number of chromosome sets doubles from one generation to the next: one diploid organism suddenly becomes a tetraploid -- i.e. it has four sets of chromosomes.

Of the bees sampled, 15% showed evidence of inbreeding, through the presence of what are called diploid males.

In diploid organisms, one set of chromosomes is inherited from each parent.

The cranberry is a diploid, which means that each cell contains one set of chromosomes from the maternal parent and one set from the paternal parent.

In the case of sexual fertilisation, the simple chromosome sets from the egg and sperm cells come together to create a double -- diploid -- chromosome set.