But Uncle to become a doctor we need to kill some animals and take them apart. Is that a sin ??
Dear Srusti, this is a tough and debatble topic, the following are my opinions and please form your opinion on this topic after you take everyones opinion and more importantly after you analyze yourself and if possible after you go thorugh the experiences yourself, ofcourse which will take several several years, for you. Also, with all people and opinions, none of the opinions are decimal or absolutely paramout than, what mahatmas or learned ones have said and what your heart agrees with (usually both will be same if placed in correct perspective). In this regard i follow buddha's quote

(see my signature quote below)
Regarding killing animals for dissections and learning and research purpose, first i always remember to respect the animal. Because I am using that species created by God for the holy purpose of learning. As said by several, work is worship.
Just say you are learning maths or english or music it is as much a holy work as you are reading arathi before Baba, if you are following your parents suggestions its as much a holy thing as worshiping supreme.
Same is the thing with work. when the work is needed and done with positive intent and with broader goal to the service of humanity or appreciate God better, than in that case killing animals is justified (again in my opinion).
But even though a scientist or medical doctor kills animals for the evil purpose of spreading diseases around, than the same act is offensive and evil. Also if a person kills an animal because of the previlage he thinks he claims from the profession he has, than that is the biggest sin ever, as all professions are very important and very holy. Every person belonging to any profession should take-up his/her work as worship and a means to reach God.
This goes back to the same point what your intent (bhavam) is towards the animals and what goal in spiritual sense.
Same was the purpose in yagnas, previously. Yagnas can be considered as a kind of offering. Killing there was actually kills a part of our best liked cattle (considered as wealth in ancient days). It was a sacred offering. But the only thing is I am not sure if that bhavam is maintained now-a-days.
Master goes over it with respect to meat-eating in sai prabodhamrutham. I think you can ask your mom to read those pages for you (or read it yourself if you can read telugu).
Now I understood why you were supporting the man because the man did it for curiosity and might for research. And Uncle you are doing something with nature, maybe for research. Uncle what are you doing and what are you ??
Again, slight change srusti, I am not supporting or opposing the man in the story, but was just analyzing all the possible outcomes of a given work. What I was taught, and I liked the best is analyzing a situation and sometimes I dont even take the meaning, personally that helped me with improving the analyzing prospect in a new situation.
As you have noticed, we started with a story, tried to analyze the moral, Supreme plan and way, next analyze the work, analyze what could have and could not have done and next, what our work in practical world... any story I think could be extrapolated more than a direct moral... and thats what i was doing.... I do it with almost all the stories, Like say take Lion-King story. Stop in the middle of the story and ask your self what the possible outcomes. Well, i was taught that by my parents and I liked it. Say I am watching a movie or reading a story, i used to write down different ways a (my) story/movie could have unfolded.
Say you are reading a miracle of baba, try to write-down how you will feel from different angles. Like say Baba lighting jyothi from water. I used analyze myself as the oil-merchant (who didnot give oil to baba) how would i feel, as a servant in masjid how would i feel, as a devotee of baba, as an athiest watching baba do it etc. and try to correlate with correcting myself in daily life. Well thats why may be i bore my freinds sometimes (rather many times), and may be I bored you now, Sorry if i did that now

Om sai ram