How did research change during the period of classical biotechnology?

The research carried out by generations of geneticists, biochemists and other bioscientists led to the development of the time - tested techniques of mutation, selection and breeding that drive the conventional biotechnology industry.

Explanation:

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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.