Category 2

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How does DNA in cells determine an organism’s complex traits?

In humans, the sex in males is determined by the:

Nitrogenous bases are located on both strands of the DNA double helix. What is the significance of the nitrogenous bases?

Human bone, muscle, and nerve cells all contain the same number of chromosomes with the same complement of genes. What enables these cells to perform specialized activities?

Characteristics such as a widow’s peak or attached earlobes are determined by the genetic code. Which components of DNA are referred to as the genetic code?

The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans-

The sequence of nitrogenous bases in DNA varies widely. The sequence of the bases in DNA is most important for which of the following?

Crossing -over between non-sister chromatids during meiosis is significant in heredity. This process most likely leads to an increase in which of the following?