At the end of meiosis ll, each of the haploid sex cells had only half the number of chromosomes as the original diploid cell. Why is this important?

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Positive feedback mechanism.

Explanation:

Feedback mechanisms are important as they maintains the homeostasis of the organism. Two main types of feedback mechanism are positive feedback mechanism and negative feedback mechanism.

The suckling of newborn increases the milk production in the female body. This is an example of positive feedback mechanism in which the final output increases the original stimulus.

Thus, the answer is positive feedback mechanism.