Gamete
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A gamete, reproductive cell, or sex cell, is a haploid cell that fuses with another haploid cell during fertilization in organisms that reproduce sexually. The name gamete was introduced by the German
A human spermatozoon fusing with a human ovum. The spermatozoon is approximately 100,000 times smaller in size than the human ovum.
Mice X Y chromosomes
Zygote
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A zygote is a eukaryotic cell formed by a fertilization event between two gametes.
Zygote formation: egg cell after fertilization with a sperm. The male and female pronuclei are converging, but the genetic material is not yet united.
Views of a Foetus in the Womb detail