It cannot be maintained that species when intercrossed are invariably sterile, and varieties invariably fertile; or that sterility is a special endowment and sign of creation.
Pure species have of course their organs of reproduction in a perfect condition, yet when intercrossed they produce either few or no offspring.
Naudin with the Cucurbitaceae; so that the production of fruit by plants rendered sterile through any cause is intelligible.
The part or organ will thus retain its full size in the embryo, as we know to be the case with most rudiments.
Plants are more strictly adapted to climate than are animals.
Hence a larger field is open for inquiry in regard to the acclimatisation of plants than of animals.
I intercrossed my plants artificially, and pollinated more than a thousand flowers.
It cannot be maintained that species when intercrossed are invariably sterile and varieties invariably fertile; or that sterility is a special endowment and sign of creation.
A cross with a fresh stock or with another variety seems to be always highly beneficial, whether or not the mother-plants have been intercrossed or self-fertilised for several previous generations.
Indeed, in two of the cases the self-fertilised plants were superior to such intercrossed plants.
Column 2: intercrossed Plants (Plants of one and the same stock intercrossed for five generations).
I have shown in my work on the 'Effects of Cross and Self-fertilisation' how greatly the offspring fromintercrossed plants profit in height, vigour, and fertility.
Twenty-one flowers, consisting of both forms of the cowslip and primrose, were intercrossed legitimately, and yielded seven capsules (i.
Twenty-one flowers on the same cowslip and primrose plants were also intercrossed illegitimately, and they likewise yielded seven capsules (or 33 per cent), but these contained on an average only 13 good and bad seeds.
But the results are much more complicated than with ordinary plants, as two heterostyled dimorphic species can be intercrossed in eight different ways.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "intercrossed" in a variety of sentences. We hope that you will now be able to make sentences using this word.
