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I have read that the apple respresents “sex”. Sex in ancient religions (and today) was used to open chakras. Eve desired these powers. Once she had obtained these powers, Adam followed suit. But not before the seeds of the bloodlines were concieved. God put eminity between her seed and his seed.
On down the line, Noah entered the “Ark” and dealt with his sin nature two by two. When he left, this journey he had made peace with God and had been changed. The nephilum were still on the earth at that time. There is more, but this is a good start to the journey through spiritual concepts and the bible.