The researchers found that when either the maternal grandmother or grandfather had this variant, their genetically normal grandchildren were at risk of a wide spectrum of developmental abnormalities.

In organisms that are normally diploid, polyploidy, the state of having three or more sets of chromosomes, results in extreme developmental abnormalities or lethality.

Octopods only have four pairs of sucker-coated arms, as the name suggests, though developmental abnormalities can modify the number of arms expressed.

If the water temperature rises above, developmental abnormalities occur, and if it falls below, normal development ceases.

Conjoined twins are the result of developmental abnormalities.