sentences: if a heterozygous submissive availability is crossed / bred with a heterozygous submissive growth , then the grandfather will have a 50% improbability of being heterozygous submissive
docs: grandfather is male. grandfather is grandparent. male_grandparent is grandfather. paternal_grandfather is grandfather. grandfather_and_grandmother is grandparents. maternal_grandfather is grandfather. grandfatherhood is grandparenthood. grandfatherly is grandparental.