细胞周期分析
深红酵母分裂期:前期,中期,后期,末期如图展示:
深红酵母的有丝分裂(mitosis)需经前、中、后,末期,是一个连续变化过程,由一个母细胞分裂成为两个子细胞。一般需1~2小时。
1.前期(prophase)染色质丝高度螺旋化,逐渐形成染色体(chromosome)。染色体短而粗,强嗜碱性。两个中心体向相反方向移动,在细胞中形成两极;而后以中心粒随体为起始点开始合成微管,形成纺锤体。随着核仁相随染色质的螺旋化,核仁逐渐消失。核被膜开始瓦解为离散的囊泡状内质网。
2.中期(metaphase)深红酵母变为球形,核仁与核被膜已*消失。染色体均移到细胞的赤道平面,从纺锤体两极发出的微管附着于每一个染色体的着丝点上。从中期细胞可分离得到完整的染色体群,共46个,其中44个为常染色体,2个为性染色体。男性的染色体组型为44+xy,女性为44+xx。分离的染色体呈短粗棒状或发夹状,均由两个染色单体借狭窄的着丝点连接构成。
3.后期(anaphase)由于纺锤体微管的活动,着丝点纵裂,每一染色体的两个染色单体分开,并向相反方向移动,接近各自的中心体,染色单体遂分为两组。与此同时,细胞波拉长,并由于赤道部细胞膜下方环行微丝束的活动,该部缩窄,细胞遂呈哑铃形。
4.末期(ophase)染色单体逐渐解螺旋,重新出现染色质丝与核仁;内质网囊泡组合为核被膜;细胞赤道部缩窄加深,后*分裂为两个2倍体的子细胞。
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