Assalamu alaikum wa rehmatullahi wa barakatuh
And in the earth are neighboring tracts, and gardens of vines, and green crops, and date-palms, growing out several from a single stem root, or otherwise (one stem root for every palm ), watered with the same water, yet some of them We make more excellent than others to eat. Verily, in these things, there are Aayaat (proofs, evidences, lessons, signs) for the people who reason.13:4
All are provided same water,all sharing same environmental conditions,yet some grow into grapes and some into dates palms.What is the difference?
The seeds?It is an obvious answer,the observation for which we do not need to exercise our logic or reasoning ability.
The answer is that there are some factors inside that seed which contribute to the specific characteristics of the plant and fruit,not only the structure but specially the taste.
These factors are known as genes and are responsible for the difference in the taste and other characteristics even for a same fruit or plant.