(genetics) The state of being dihaploid wherein the haploid cell having two copies of the set of chromosomes
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.
Word origin: from dihaploid – coined by Bender in 1963 to combine in one word the number of genome copies (diploid) and their origin (haploid)
- dihaploid (noun)
- dihaploidic (adjective, of, or pertaining to, dihaploidy)