The correct statement among the options provided is:
In humans, genes are passed to an offspring from two parents.
Here's a quick explanation of why the other statements are not true:
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Genes are responsible for all the traits of an organism. - This is not entirely accurate as traits can also be influenced by environmental factors in addition to genetics.
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Genes are made up of smaller molecules known as chromosomes. - This is incorrect because chromosomes are structures that contain genes, not the other way around. Genes are made up of DNA, which is organized into chromosomes.
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The genes of a particular organism can never change throughout its lifetime. - This statement is false because while an organism's genetic code does not change, gene expression can change due to various factors, such as environmental influences or mutations. Additionally, somatic mutations can occur, and epigenetic changes can affect how genes are expressed.