Which one of the following conditions is true for parthenogenesis?
Syngamy fails
Parthenogenesis is the development of a new individual from an unfertilised egg, seen in many invertebrates and some vertebrates such as certain lizards and fishes.
Because no sperm fertilises the ovum, syngamy, which is the fusion of male and female gametes to form a zygote, does not occur; gametogenesis itself proceeds normally to produce the egg.
The other options are incorrect: syngamy occurring would be ordinary sexual reproduction, gametogenesis failing would prevent even egg formation, and gametogenesis occurring alone does not distinguish parthenogenesis from typical reproduction.
Hence, the correct choice is Syngamy fails.
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