A gene is a basic unit of heredity and a sequence of nucleotides in DNA that encodes the synthesis of a gene product, either RNA or protein. For example, if both of your parents have green eyes, you might inherit the trait for green eyes from them.
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Maybe it is 5.50 because not much information is given to calculate it or to find it.
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This should help you understand more about DNA replication
and it also has a picture.
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A hamster is a primary consumer because it feeds on primary producers (plants).