IPA: /dʒəˈnɛtɪkli/
KK: /dʒəˈnɛtɪkli/
In a way that is connected to genes or the science of heredity.
The plants were modified genetically to resist pests.
Genetically → It is formed from "genetic" (from Greek "genetikos", meaning relating to birth or origin) and the suffix "-ally" (meaning in a manner of). The word "genetically" refers to something that is related to or occurs in a manner pertaining to genes or heredity.
Think of 'genetic' which relates to 'birth' or 'origin' — and the '-ally' means in a manner of. So, genetically means in a manner related to birth or genes.