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Learning is usually defined as a change in an individual caused by experience. Changes caused by development are not instances of learning. Neither are characteristics of individuals that are present at birth. However, human beings do so much learning from the day of their birth that learning and development are inseparably linked

Most of the eukaryotic genes are mosaic (嵌合体), consisting of intervening sequences separating the coding sequence ◼ Exons (外显子): the coding sequences ◼ Introns (内含子) : the intervening sequences ◼ RNA splicing: the process by which introns are removed from the pre￾mRNA. ◼ Alternative splicing (可变剪接): some pre-mRNAs can be spliced in more than one way , generating alternative mRNAs. 60% of the human genes are spliced in this manner