Question

what process produces the wide variety of cells found in complex organisms?

nondisjunction

cellular differentiation

crossing over

cytokinesis

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Explanation:

To determine the correct answer, we analyze each option:

• Nondisjunction: Occurs during cell division when chromosomes fail to separate properly, leading to aneuploidy (abnormal chromosome numbers), not cell variety.
• Cellular Differentiation: The process by which cells become specialized in structure and function. In complex organisms, stem cells differentiate into various cell types (e.g., muscle, nerve, blood cells), creating the wide variety of cells needed for tissue and organ function.
• Crossing Over: Happens during meiosis, where homologous chromosomes exchange genetic material, increasing genetic diversity in gametes, not directly producing cell variety in organisms.
• Cytokinesis: The physical separation of a cell into two daughter cells after mitosis or meiosis, involved in cell division but not cell specialization.

Thus, cellular differentiation is the process that produces the wide variety of cells in complex organisms.

Answer:

B. cellular differentiation