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Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

Amylase becomes denatured at a temperature of 80°c. during an experiment to study the effect of varyingtemperature on enzyme activity, amylase’s reactivity with starch was measured at body temperature (37°c), andthen again at an increased temperature of 42°c. how would this increase in temperature affect the experiment

What is the term for the two sets of chromatids formed in the parent cell a.haploid b.diploid c.gamete d.tetrad