Michigan Test for Teacher Certification (MTTC) Secondary Integrated Science Practice test

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Which process results in the division of sex cells?

Mitosis
Binary Fission
Meiosis
Fertilization

The correct answer is: Meiosis

Meiosis is a specialized type of cell division that produces sex cells, or gametes, which are essential for sexual reproduction. This process involves two rounds of division (meiosis I and meiosis II) that ultimately reduce the chromosome number by half, resulting in four unique haploid cells from one diploid cell. In humans and many other organisms, this reduction is crucial for maintaining the correct chromosome number across generations when gametes fuse during fertilization to form a zygote. The unique way meiosis introduces genetic diversity through crossing over and independent assortment of chromosomes also highlights its essential role in sexual reproduction. Such processes do not occur in mitosis, which merely results in two identical diploid daughter cells, nor in binary fission, which is a form of asexual reproduction typically observed in prokaryotes. Fertilization, on the other hand, is the event where two gametes fuse, rather than being a process of cell division itself.