Section: Science

111) Which of the following statements about human genetics is true?

A human looks 50% like the father, and 50% like the mother.
Genes are particles found in the nucleus of DNA atom.
Exposure to X-rays can have no effect on a human’s chromosomes.
Half the chromosomes in a human are inherited from the mother, and half from the father.
Fraternal twins are genetically more similar than siblings who are not twins.

Explanation

Every human normally inherits 23 chromosomes from the mother and 23 chromosomes from the father.