purebred

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Color breeds do not breed true. Table A-16 in the appendix lists the names and addresses of many breed registries.
Because high-yielding hybrid seeds don't breed true, corn growers in the U.S.
You can collect seed from anything although don't expect seed from F1 and F2 hybrids to breed true. You need to go back to the original cross to produce the same plant again.
There are plenty of bad sires who breed true for colour, and plenty of good ones who do not.
In other words, it won't breed true. Open-pollinated seeds will continue to breed true for generations, until a genetic mutation or cross-pollination (by insects, wind, or plant breeder's touch) by another variety occurs.
The Jewish Chancellor of the University of Ulster, Rabbi Julia Neuberger admitted that not even the classroom can breed true tolerance.
Those that did not breed true gave rise to tall plants three-quarters of the time and to dwarf plants one-quarter of the time.