Why and how is asexual reproduction possible?

Asexual reproduction occurs when an organism makes more of itself without exchanging genetic information with another organism through sexual interaction. Asexual reproduction in animals only occurs through fission, budding, fragmentation, and parthenogenesis. Its kind of like cells, they're just make identical copies of themselves.

I hope this was a decent answer, not really sure what you wanted here. Have a lovely day <3

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c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.