In this video we are will look at mitosis, including the names of the key stages: interphase, prophase, metaphase, anaphase, telophase and cytokinesis.
Mitosis is the process of cell division that produces identical copies of cells, and is involved in growth, cell repair and asexual reproduction. When cells divide by mitosis, the number of cells increases, and hence the organism grows.
Different organisms have different numbers of chromosomes. A chromosome is made up of two chromatids; one from the mother and one from the father.
During interphase, the chromosomes duplicate and become two identical chromatids, joined at the centromere. So in humans, it has gone from the normal 46 to 92.
During prophase, the chromosomes condense in the nucleus, and the spindle fibres form in the cytoplasm.
During metaphase the nuclear membrane breaks apart, the spindle fibres attach to the chromosomes and the chromosomes line up at the equator of the cell.
In anaphase, the spindle fibres shorten and the centromere divides, so that each chromosome becomes two separate chromatids.
During telophase the nuclear membrane forms around each set of chromosomes. The chromosomes spread back out in their ‘new’ nucleus and the spindle fibres break down. In humans, each nucleus has the normal ‘46’ chromosomes again.
The final stage is cytokinesis. The cell membrane pinches in to separate the two sets of chromatids into two identical daughter cells, with the same number of chromosomes as the parent - so 46 (or 23 pairs) in humans.
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Let’s discover some more circle theorems so that we can solve all types of geometrical puzzles.
We discovered these 4 theorems in part 1:
Angle at the centre is double the angle at the circumference
The angle in a semi-circle is 90 degrees
Angles in the same segment are equal / Angles subtended by
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If we don't have the vertical height of a triangle, then we can find the area of the triangle using 1/2absinC.
In this video we are going to discover where this formula comes from. The formula is based on area = 1/2 base X height and a
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Learn the basics about the principles of green chemistry as a part of the environmental chemistry topic.
Our teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT.
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