Explain why mitosis could not provide for the sexual reproduction of offspring that contain the same number of chromosomes as the parents.MITOSIS

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lynn30k's profile pic

lynn30k | High School Teacher | (Level 1) Educator

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Mitosis results in identical cells that have the same number of chromosomes as the original cell. When the process starts, the genetic material is duplicated into two chromotids. When the cell divides, one of each set of each chromotids goes to each of the daughter cells. Since the daughter cells have all the genetic material of the original, they cannot be used for sexual reproduction. When sexual reproduction occurs, the genetic material of two cells is combined. If this would happen with cells with the normal complement of chromosomes (the diploid number), the cells would have twice as much genetic material as necessary in the next generation, four times as much in the next, eight times the next, and so on. In order to keep the same number through the generations, the amount of genetic material in sperm and egg cells must be divided in half through meiosis. Then, when the egg is fertilized by the sperm cell, the diploid number is restored.

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ndixson | Middle School Teacher | eNotes Newbie

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Mitosis is cell division that results in diploid cells, or cells with twice the genetic information (one set from mom, one set from dad) identical to the original cell. In humans mitosis results in cells with 46 chromosomes. If each parent donated ALL of their genetic information (46 chromosomes each) to a sex cell (egg or sperm) then the offspring would have twice the genetic information as each parent (46 from mom + 46 from dad= 92 chromosomes). As a result each generation would double the amount of chromosomes. That is why mitosis is used for only asexual reproduction, or reproduction with one parent only [binary fission], and not sexual reproduction with two parents. When two parents contribute each can only donate half, where two halves combien to make one whole new individual. Meiosis is a special process of cell division that results in cells that have half the genetic information. Meiosis is used to create sex cells, used in sexual reproduction. Each sex cell has half the genetic information (haploid), in humans 23 chromosomes, and when two sex cells combine (fertilization of egg [23 chromosomes] with sperm [23 chromosomes] then the result is a full or diploid cells with 46 chromosomes. This conserves the amount of genetic material from generation to generation.

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