two main ways variation is introduced :
independant or random assortment:
- chromosomes that came from the individual's parents are distributed into the gametes so into their offspring at random
- crossing over
Crossing over or recombination
- when the maternal chromatids are 'cut and stiched' together. The point where the chromatids break are called chiasmata. These are important in two ways to exchange genetic material. The second is through errors in the process leads to further mutation.
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