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Which of the following statements about human genetics is TRUE?

A Half the chromosomes in a human are inherited from the mother, and half from the father.

Every human normally inherits 23 chromosomes from the mother and 23 chromosomes from the father. However, that doesn’t mean that humans look exactly 50% like the father and 50% like the mother, since one parent’s genes can be more dominant, and since genes from two parents sometimes produce a blended effect. Fraternal twins happen to be in the womb at the same time, but genetically, they are not any more similar than two siblings who are not twins. Fraternal twins come from two different eggs fertilized by two different sperm cells. Exposure to X-rays can alter chromosomes. Genes are not particles. DNA is not an atom and it doesn’t have a nucleus. Genes are found in the nucleus of a cell and are made of DNA.

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