人 / 脱氧核糖核酸 / 有丝分裂

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股票视频说明
Synopsis
Animation of human chromosomes. Chromosomes are structures containing an organism's DNA genetic material; which form during cell division. DNA usually exists as a long strand in the cell's nucleus; and it is replicated in this form. During replication; another copy of the DNA is produced. In preparation for mitotic cell division; the DNA condenses into chromosomes; a tightly-packed form of DNA shaped like an X. The X is formed of the two identical copies of the genetic material left after replication. These are linked by a central region called the centromere. During mitosis; the two halves of the chromosome (chromatids) separate at the centromere; and each half is pulled to opposite sides of the cell. This then divides; giving rise to two identical daughter cells. Humans have 23 pairs of chromosomes; half of each pair from the mother and father. This animation is also available on a white background (K005 5520) and a transparent background (K005 5521).
Activity
缩合
Further内容信息
有丝分裂 细胞分裂 细胞生物学) 细胞生物学 生物学 DNA复制 染色体 脱氧核糖核酸 基因组 遗传学 分子生物学 生殖(生育) 移动电话 电话 电信 通信技术 黑色) 活人
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