Double Haploids are plants that have two copies of each chromosome, (2n), like diploids. However, they differ from diploids in that they were created from a single grain of pollen, an ovum, or indeterminate gametes that were cultured, their chromosomes doubled through chemical means, and the cultured tissue grown into a plant. The haploid genome of the gametes, when doubled, produced a plant with a complete genome, with two identical copies of every gene. Thus, Double Haploids are Homozygous at every locus, and can have highly variable phenotypes. Double Haploids have been made for many plants to assist in breeding experiments.
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