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Haploidisation is the process of halving the chromosomal content of a cell, creating a haploid cell. Within the normal reproductive cycle, haploidisation is one of the major functional consequences of meiosis, the other being a process of chromosomal crossover that mingles the genetic content of the parental chromosomes. Haploidisation commitment is a checkpoint in yeast meiosis that does not occur at 34 C in the temperature-sensitive ''cdc5-1'' mutant strain, which follows the successful completion of premeiotic DNA replication and recombination commitment.〔PMID 1981〕 Usually, haploidisation creates a monoploid cell from a diploid progenitor, or it can involve halving of a polyploid cell, for example to make a diploid potato plant from a tetraploid lineage of potato plants. If haploidisation is not followed by fertilisation, the result is a haploid lineage of cells. For example, experimental haploidisation may be used to recover a strain of haploid ''Dictyostelium'' from a diploid strain.〔PMID 7227041〕 Haploidisation sometimes occurs naturally in plants when meiotically reduced cells (usually egg cells) develop by parthenogenesis. This was one of the procedures used by Japanese researchers to produce Kaguya, a fatherless mouse. == See also == * Polyploidization * Ploidy 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Haploidisation」の詳細全文を読む スポンサード リンク
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