noun. (genetics) an organism or cell having more than twice the haploid number of chromosomes.
adjective. of a cell or organism having more than twice the haploid number of chromosomes.
1. Noun, singular or mass The second advantage of being polyploid is that the organism has extra copies of genes that can be mutated without harming the organism. 2. Adjective However, polyploid organisms have many copies of a gene, so if one of them is mutated and produces a broken protein machine the other copies still make good proteins that keep the cell alive.