The wandering life of the larvae makes it uncerain whether any of the progeny of a given oyster-bed will settle within its area and so keep up its numbers.
Having crossed yellow and green seeded peas both ways, he found that the progeny resulted in all yellow coloured seeds.
Eny very unlike the parent, or a mixed progeny showing various degrees of divergence.
According to some, Niobe is the goddess of snow and winter, whose children, slain by Apollo and Artemis, symbolize the ice and snow melted by the sun in spring; according to others, she is an earth-goddess, whose progeny - vegetation and the fruits of the soil - is dried up and slain every summer by the shafts of the sun-god.
Hybrid plants may be again crossed, or even re-hybridized, so as to produce a progeny of very mixed parentage.