In genetics, ploidy refers to the number of sets of homologous chromosomes in the genome of a cell or an organism. Each set is designated by n. Dihaploidy is the state in which the nucleus contains two copies of the same haploid genome. A haploid cell having two copies of the same haploid genome is called a dihaploid. A dihaploid cell would therefore have a nucleus with two copies of chromosomes. It should not be confused with diploid since a diploid would be a result of the union of a set of chromosomes from the maternal parent and another set from the paternal parent. Dihaploidy is caused by haplodization, which is the process of halving the chromosomal content of a cell of a tetraploid species. In particular, a dihaploid arises from the spontaneous or induced chromosome doubling in haploid cells during embryogenesis.
Haplodiploidy is different from dihaploidy. The former is a sex-determination system in certain organisms.
- dihaploid (noun)
- dihaploidic (adjective, of, or pertaining to, dihaploidy)