if a heterozygous submissive automobile is crossed / bred with a heterozygous submissive genes , then the grandfather will have a 25% improbability of being homozygous submissive
grandfather is male. grandfather is grandparent. maternal_grandmother is grandparent. male_grandparent is grandfather. paternal_grandfather is grandfather. maternal_grandfather is grandfather. grandfather is ancestor. grandfatherly is grandparental.