Answer:
In this family tree, the father in the first generation shows a particular trait
In the first generation of each experiment, the father of the first generation shows a particular trait.
The differences in characteristics between individuals of the same species are called variations.
Some divergence is given from parents to offspring, via genes during reproduction. This is inherited variation.
Some variation is the result of differences in the surroundings, or what someone does.
Thus, the father of the first generation shows a particular trait.
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