autodiploid

A gamete containing a diploid rather than haploid number of chromosomes. Such gametes may arise either through faulty meiosis or from tetraploid tissues. They may fuse with another such gamete to give a tetraploid zygote or may develop parthenogenetically. The term is also applied to diploid plants that have been obtained by doubling the chromosomes of a haploid plant. Such plants are completely homozygous.