Linked genes are genes that <em>sit close together on the same chromosome,</em> this closeness makes higher the probability to inherit them together, meaning they won't follow Mendelian inheritance. Considering this information we can conclude that the correct answer is d. are found on the same chromosome.
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Some individuals are more likely to survive and reproduce than others because they are fit and easily adapting. This idea is called 'survival of the fittest'.
