1. A child has brown hair and brown eyes. His father has brown hair and blue eyes. His mother has red hair and brown eyes. The best explanation for the child having brown hair and brown eyes is that

All cells in an embryo have the same DNA. However, the embryonic cells form organs, such as the brain and the kidneys, which have very different structures and functions. These differences are the result of

A mutation changes a gene in a cell in the stomach of an organism. This mutation could cause a change in

The DNA of a human cell can be cut and rearranged using

A boy inherits genes for tallness, but his growth is limited as a result of poor nutrition. This is an example of

Chromosome can be described as

Cells that develop from a single zygote all contain identical DNA molecules. However, some of these cells will develop differently because

Mustard gas removes guanine (G) from DNA. For developing embryos, exposure to mustard gas can cause serious deformities because guanine

29. In sexually reproducing organisms, mutations can be inherited if they occur in

One disadvantage of a genetic mutation in a human skin cell is that it

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