An ordinary body cell is diploid; i.e., it contains two of each type of chromosome. The members of each pair are known as homologous chromosomes. An ovum or sperm is haploid; i.e., it contains only a single chromosome of each type and, therefore, half the number of chromosomes of ...
1. Cycling meiosis and fertilization events produces a series of transitions between alternating haploid and diploid states. 减数分裂和受精作用的周期甚至产生了一个在单倍体阶段与二倍体阶段来回交替的过渡序列. 来自期刊摘选 2. Abnormal meiosis also was observed. 还观察到花粉母细胞异常减数分裂现象. 来自...
Cycling meiosis and fertilization events produces a series of transitions between alternating haploid and diploid states. 减数分裂和受精作用的周期甚至产生了一个在单倍体阶段与二倍体阶段来回交替的过渡序列. 期刊摘选 Abnormal meiosis also was observed. 还观察到花粉母细胞异常减数分裂现象. 期刊摘选 Bivalent...
Meiosis is a type of cell division in which one cell with a diploid nucleus divides into 4 cells with haploid nuclei. 最开始是染色体的发现,描述和命名,慢慢地开始研究有丝分裂和减数分裂。通过染色对性细胞(germ-line cell)分裂的仔细观察,揭示了受精过程中减数分裂的复杂过程。减数分裂是有性繁殖的生物...
Haploid Vs Diploid Next arehaploidand diploid. Haploid refers to a single copy of chromosomes in a cell while diploid is for two copies of the chromosomes. Human cells are diploid. We get one copy from our father and one from our mother. However, the gametes or sex cells are haploid. ...
1.GeneticsThe process of cell division in sexually reproducing organisms that reduces the number of chromosomes from diploid to haploid, as in the production of gametes. 2.Rhetorical understatement. [Greekmeiōsis,diminution, frommeioun,to diminish, frommeiōn,less; seemei-inIndo-European roots.] ...
The process of meiosis is characteristic of organisms that reproduce sexually. Such species have in the nucleus of each cell adiploid(double) set of chromosomes, consisting of twohaploidsets (one inherited from each parent). These haploid sets are homologous—i.e., they contain the same kinds ...
Meiosis 1 is a reductional phase where ploidy number is reduced in the cell. The initial cell in meiosis 1 is diploid, and the product is two haploid daughter cells. Meiosis 2 is an equational phase where ploidy number is unchanged in the cell. The initial two cells in meiosis 2 are ha...
Occurs inovariesOvariesOvaries are the paired gonads of the female reproductive system that contain haploid gametes known as oocytes. The ovaries are located intraperitoneally in the pelvis, just posterior to the broad ligament, and are connected to the pelvic sidewall and to the uterus by ligaments...
In diploid organisms, meiosis generates gametes with a haploid number of chromosomes. Both general cell-cycle regulators and meiosis-specific proteins bring about this modified cell division. Although pre-meiotic S phase uses the same replicative machinery as pre-mitotic S phase, its completion takes...