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I don't think I do. I am guessing an induced trait = natural selection, or taking a trait available. And random mutations are how the morphological changes happen. I would have to study more to go further as I get confused when we add the mechanism of mutation. I can understand that traits available in the gene pool already can be used = natural selection - I should really be trying to find that topic - and ask over there.
An analogy I find helpful is a combination lock on a briefcase. Pretend that there are 10 tumblers, each with a 0-9 (like those on a briefcase). Starting with the first tumbler, you randomly choose a number. If you hit the right number for that tumbler, a green light will flash above the tumbler. Proceeding down the line, you do the same at each tumbler, randomly picking numbers and stopping once the light comes on . In this analogy, random mutation is the process of randomly picking the numbers. Natural selection is the flashing green light. While mutations are random, the selection for the "right number", or a beneficial mutation, is not. The "green light" will only come on when the right number is randomly hit. This is why natural selection is often called a process of accretion, since the "right numbers" or beneficial mutations are kept and more are added to them. Without selection, you would have to get all 10 numbers right at the same time. Using the analogy, selection allows you to get the right combination in a maximum of 100 tries (10 tries at 10 tumblers) while a system without selection requires a maximum of 10^10, or 10 million tries.