English: Fertilisation phases of a human egg. The middle part of the sperm with mitochondria of the father remains outside the zygote. The mitochondria of the mother are already in the oocyte.
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Own work. Own graphic. Source: Figure 27.9C Campbell Biology, Pearson Education 2012
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Fertilisation egg cell - sperm
A labelled diagram of fertilisation of a human egg by a sperm cell.