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In the process, the nucleus of an egg is inserted into the cytoplasm of an egg from a donor female which has had its nucleus removed, but still contains the donor female's mtDNA. The composite egg is then fertilized with the male's sperm.
A human egg/sperm cell has 23 chromosomes. When the sperm and egg fuse together,, the zygote (fertilised egg) contains 46 chromosomes. Scientists call this the diploid number, â¦ with the sperm/egg having a haploid number of chromosomes. This number varies between species. human egg/sperm cell has 23 chromosomes. When the sperm and egg fuse together,, the zygote (fertilised egg) contains 46 chromosomes. Scientists call this the diploid number, â¦ with the sperm/egg having a haploid number of chromosomes. This number varies between species.