Progeny- Offspring, descendants.
Siblings — Individuals having same parents.
Polyhybrid cross- A breeding experiment dealing with more than two traits at a time.
Inbreeding- Production of offsprings by mating of closely related parents such as cousins.
Outbreeding- Production of offsprings by mating of unrelated parents.
Heterosis or Hybrid vigour- Greater vitality and vigour of the heterozygous individuals produced by outbreeding is called heterosis.
Atavism—Occasional reappearance of a remote ancestral trait in some individual. Ex. Short tail in some babies.