What phase of mitosis do chromosomes unwind?
During anaphase sister chromatids have been separated and reside at opposite poles of the cell. During telophase both sets of chromatids are surround by new nuclear membranes and chromosomes decondense into chromatin.
During which phase do chromosomes come apart?
During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes. The chromosomes are separated by a structure called the mitotic spindle.
In what phase of meiosis the chromosomes unwind into a mass of chromatin?
Anaphase : sister chromatids separate and move toward the centrioles. Telophase : the chromosomes begin to unwind and a nuclear envelope reforms.
What is S phase in cell cycle?
S phase is the period of wholesale DNA synthesis during which the cell replicates its genetic content; a normal diploid somatic cell with a 2N complement of DNA at the beginning of S phase acquires a 4N complement of DNA at its end.
What are the 4 stages of the cell cycle?
In eukaryotes, the cell cycle consists of four discrete phases: G1, S, G2, and M. The S or synthesis phase is when DNA replication occurs, and the M or mitosis phase is when the cell actually divides. The other two phases — G1 and G2, the so-called gap phases — are less dramatic but equally important.
What happens during metaphase II?
Metaphase II is the second stage in meiosis II. … The cell is in metaphase II when the chromosomes align themselves along the metaphase plate through the facilitation of the spindle fibers. The spindle fibers are now attached to the two kinetochores contained in the centromere of each chromosome.
During which stage of the cell cycle does cell division occur?
The cell cycle has two major phases: interphase and the mitotic phase (Figure 1). During interphase, the cell grows and DNA is replicated. During the mitotic phase, the replicated DNA and cytoplasmic contents are separated, and the cell divides.
In which phase of mitosis are chromosomes first seen as a result of chromatin coiling?
The first and longest phase of mitosis is prophase. During prophase, chromatin condenses into chromosomes, and the nuclear envelope (the membrane surrounding the nucleus) breaks down. In animal cells, the centrioles near the nucleus begin to separate and move to opposite poles of the cell.