variation

variation

The differences in the characters among the individuals of a species is called variation  for example: free earlobe or attached earlobe                        is a variation found in human                        population.

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Accumulation of variation

The significant of a variation shows up only if it continues to be inherited by the offspring for several generation. the great advantage of variation to a species is that it increases the chance of its survival in changing enviroment 

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A gene is the unit of DNA on chromosomes which governs the synthesis of one protein that controls a specific characteristics of an organism. genes transfer CHARACTERISTICS from parents to offspring.

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Rules for inheritance of traits

Caption: : Mendel's pea experiment