Question

multiple choice question
which of the following does not produce genetic variation in offspring?

crossing over during meiosis
random assortment of chromosomes during meiosis
separation of sister chromatids during mitosis
fertilization of egg with sperm

Explanation:

To determine which option does not produce genetic variation:

• Crossing over (meiosis): Exchanges genetic material between homologous chromosomes, creating variation.
• Random assortment (meiosis): Randomizes chromosome distribution in gametes, increasing variation.
• Separation of sister chromatids (mitosis): Mitosis produces genetically identical daughter cells (e.g., for growth/repair), so this process does not introduce new genetic variation in offspring.
• Fertilization: Combines unique genetic material from egg and sperm, creating variation.

Answer:

separation of sister chromatids during mitosis