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Question Video: Describing the Result of an Ovum with More Chromosomes than Normal Being Fertilized Biology

A human ovum contains 24 chromosomes. It is fertilized by a sperm cell with the normal number of chromosomes. Which of the following is true about the zygote that will develop? [A] The zygote will contain the normal number of chromosomes, but these chromosomes will not pair correctly. [B] The zygote will fail to develop into an embryo. [C] The zygote will contain one too many chromosomes. [D] the zygote will contain an additional pair of chromosomes.

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Video Transcript

A human ovum contains 24 chromosomes. It is fertilized by a sperm cell with the normal number of chromosomes. Which of the following is true about the zygote that will develop? (A) The zygote will contain the normal number of chromosomes, but these chromosomes will not pair correctly. (B) The zygote will fail to develop into an embryo. (C) The zygote will contain one too many chromosomes. Or (D) the zygote will contain an additional pair of chromosomes.

Sperm and egg cells are gametes, which means they are haploid. Haploid cells contain half the number of chromosomes than all other cells in the body. In humans, we contain 46 chromosomes in our body cells and 23 chromosomes in our gametes. When the egg and sperm join by fertilization, they produce a zygote with a full set of 46 chromosomes.

However, in this question, the egg cell has 24 chromosomes instead of 23. This extra chromosome is often due to an error in meiosis, the type of cell division that makes gametes. So, after fertilization of an ovum with 24 chromosomes with a sperm cell with 23 chromosomes, a zygote with 47 chromosomes is the result. This zygote will contain one extra chromosome and have 47 chromosomes instead of the normal 46. Therefore, answer choice (C) is the correct choice. The zygote will contain one too many chromosomes.

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