AP BIOLOGY

Detailed explanation-1: -Meiosis occurs in all sexually-reproducing single-celled and multicellular organisms (which are all eukaryotes), including animals, plants and fungi. It is an essential process for oogenesis and spermatogenesis.

Detailed explanation-2: -The vast majority of eukaryotic organisms, both multicellular and unicellular, can or must employ some form of meiosis and fertilization to reproduce. Meiosis employs many of the same mechanisms as mitosis.

Detailed explanation-3: -So, the correct answer is ‘Meiosis produces gametes that contain one complete haploid set of chromosomes’

Detailed explanation-4: -Meiosis is the process of chromosomal reduction in eukaryotic cells (plants, animals, and fungi), which leads to the production of germ cells (gametes/sex cells) needed for sexual reproduction.

Detailed explanation-5: -Unicellular eukaryotes, such as yeasts, can undergo meiosis as well as reproducing by mitosis. Diploid Saccharomyces cerevisiae, for example, undergo meiosis and produce spores when faced with unfavorable environmental conditions.