Answer:
The parents alleles would be GG and gg. the reason why is if they were both GG they would all be GG. If they were both gg all the offspring would be gg. hope this helps.
Explanation:
If it killed the top level of an ecosystem it would damage the whole ecosystem because it's connected. An organism depends on that top organism which would mean that is that organism dies it would affect the organism that depends on it.