Fig. 5.—

Hybridization does not repress the partial nature of endoreplication. Genome-size (2C pg) versus the quantity of DNA replicating at the first endocycle (2p pg) for 65 diploid hybrids and the parents V. ×tahitensis and V. pompona. The theoretical midpoint between the parents is indicated by an arrow. See table 2 (grey row) for data. 2p is expressed in absolute units (pg) to avoid using proportions when the relevant genome-sizes differ. The mean genome-size of the hybrids was close to the mean between the parent species (arrowhead) (5.592 vs. 5.621 pg, see table 1), reflecting a balanced mixture of the parental chromatin. Note that hybrid 2p equivalent skewed from the midpoint between the parents to the low value characteristic of V. ×tahitensis.