학생 안녕하세요. 답변이 늦어서 미안해요~

#20 If egg is fertilized by two sperm, wouldn't that make it 3n so if it divides into 3 poles, it is still n number of chromosomes in each?

--> but still the cytokinesis will divide the cytoplasm into 2 dauther cells, not 3, which will each have abnormal number of chromosomes. 

#56 E는 왜 답이 될 수 없나요? cell division을 하면 결과가 two larves 로 나오지 않나요? 아니면 이런 경우가 항상 보장되지 않아서 인가요?

-->아직 2 ball stage 이라서 it is indeterminate cleavage, which means when cleavaged cells are seperated from each other still it can develop into functional, identical larvae. But as cleavage continues ( cell division continues) each cells will be determined and do determinate cleavage, which means  when cleavaged cells are seperated from each other it cannot develop into functional, identical larvae. 그래서 cell division이라고 일반적인 용어를 썼기 때문에 틀렸고 딱 이케이스에서만 그렇다 라고 했으면 맞았을 겁니다. 학생말대로 이런 경우가 항상 보장되지 않아서이죠 ^^