A stage at which the organism is a single cell produced by means of sexual reproduction.

one cell stage, 1-cell stage, fertilized egg stage

uberon

zygote, zygotum, one-cell stage, fertilized egg stage

As in all metazoans, eumetazoan development begins with a fertilized egg, or zygote.[well established][VHOG]

UBERON:0000106

http://purl.obolibrary.org/obo/uberon.owl, http://purl.obolibrary.org/obo/cl.owl

http://purl.obolibrary.org/obo/EMAPA_16033

• anatomical structure

• life cycle

• cleavage stage