How cells use checkpoints at the end of G1 phase, end of G2 phase, and partway through M phase (the spindle checkpoint) to regulate the cell cycle.

A cell spends most of its life in interphase, which has three phases: G1, S, and G2. In the G1 phase, the cell grows and takes in nutrients. In the S phase, the cell's DNA is replicated. Each replicated …

During the G1 phase of the cell cycle, the cell is diploid. This means it has two sets of chromosomes, one from each parent. The G1 phase is the first gap phase after cell division, where the cell grows …

Plant cells have cell walls, so cytokinesis in these cells happens differently compared to animal cells. During cytokinesis, a structure called the cell plate forms halfway between the separated nuclei. The …

The great majority of the cell divisions that happen in your body involve mitosis. During development and growth, mitosis populates an organism’s body with cells, and throughout an organism’s life, it …

Interphase is the longest part of the cell cycle. This is when the cell grows and copies its DNA before moving into mitosis. During mitosis, chromosomes will align, separate, and move into new daughter …

In healthy cells, during interphase, which encompasses the G1, S, and G2 phases, as well as mitosis, internal and external checkpoints regulate and control the process. DNA is properly replicated, the …

G1 cyclins levels are not required throughout mitosis. In fact, the concentration of G1 cyclin drops during mitosis. Don't confuse the cyclin expression cycle with mitosis. The cyclin expression cycle refers to …

Here is a drawing of what happens in a nematode nucleus (diploid number 4) during interphase, with individual chromatids represented as numbers, sister chromatids as the same number, and the …

The spots where crossovers happen are more or less random, leading to the formation of new, "remixed" chromosomes with unique combinations of alleles. After crossing over, the spindle begins …