Oogonium
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An oogonium is a small diploid cell which, upon maturation, forms a primordial follicle in a female fetus or the female gametangium of certain thallophytes.
A Thalassiosira pseudonana diatom oogonium beginning to expand through the cell wall. Artificial coloring denotes chlorophyll (blue) and DNA (red).
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