Question
Yeasts are single-celled eukaryotic organisms. Yeasts undergo mitotic division when conditions are favorable. When limited nutrients are available, yeasts start dividing by the process of meiosis. What is a likely reason for the change from mitosis to meiosis during reproduction under these conditions? The process of meiosis produces greater numbers of yeast cells at a faster rate as compared to mitosis. Crossing over of genes during meiosis increases diversity and the chance of survival of the next generation. Duplication of genes during meiosis ensures efficient functioning of the newly formed yeast cells. The yeast cells formed by meiosis are able to adapt as well as the parent cell because they are identical.
Answer
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Harrison
Master · Tutor for 5 years
Answer
Crossing over of genes during meiosis increases diversity and the chance of survival of the next generation.
Explanation
Under favorable conditions, yeasts undergo mitotic division to produce identical cells for better adaptation to consistent environments. When nutrients are limited, shifting to meiosis is advantageous as it promotes genetic diversity through processes like crossing over and independent assortment. This increased genetic diversity can enhance the survival of the next generation in a changing or less favorable environment. The statement that crossing over of genes during meiosis increases diversity and the chance of survival of the next generation is therefore the most accurate explanation for why yeasts switch from mitosis to meiosis under limited nutrient conditions.