dysgenesic

adjective5

1. •
   Of, pertaining to, or causing dysgenesis.
2. •
   Tending to stunt to interfere with normal healthy development.

   • Polymorphism under Dysgenesic Conditions. The variations manifested by bacteria are still more curious when the latter are placed under conditions unfavorable to their development. — 1903
3. •
   Involving reproduction by couples of different races, believed to lead to inferior offspring.

   • He would encourage by bonuses, eugenic and discourage by fines dysgenesic marriages among his employees. — 1917
4. •
   Tending to promote childlessness.
5. •
   Infertile when crossed with a similar hybrid but marginally fertile when crossed with one of the parent species.

   • Fecundation is […] dysgenesic when the hybrids, although mutually sterile, are fecund when crossed with an individual of one or the other of the parent races — 1906