Describe what happens to the nucleus of the egg cell and the nucleus of the sperm cell during fertilisation.

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Multiple Choice

Describe what happens to the nucleus of the egg cell and the nucleus of the sperm cell during fertilisation.

Explanation:
During fertilisation the egg and sperm each bring a haploid nucleus. These nuclei come together and their genetic material fuses to form a single nucleus with a full diploid set of chromosomes. This fusion, known as pronuclear fusion or karyogamy, creates the zygote’s genome so the embryo can begin normal development. The other possibilities don’t fit because the nuclei do not divide at this moment, they do not stay separate, and they do not remain unchanged — they merge into one nucleus to establish the diploid complement.

During fertilisation the egg and sperm each bring a haploid nucleus. These nuclei come together and their genetic material fuses to form a single nucleus with a full diploid set of chromosomes. This fusion, known as pronuclear fusion or karyogamy, creates the zygote’s genome so the embryo can begin normal development. The other possibilities don’t fit because the nuclei do not divide at this moment, they do not stay separate, and they do not remain unchanged — they merge into one nucleus to establish the diploid complement.

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