Biology Regents Practice Exam 2026 – The All-in-One Guide to Master Your Regents!

Question: 1 / 400

Which factor most directly affects the expression of genetic traits in an individual organism?

The organism's DNA sequence.

The expression of genetic traits in an individual organism is most directly affected by the organism's DNA sequence. The DNA sequence contains the specific instructions for building proteins, which perform various functions within the body. These proteins are responsible for the physical traits and characteristics observed in the organism, which are referred to as its phenotype.

While the genetic makeup of its parents contributes to the organism's DNA, it is the specific sequence of nucleotides in the organism's own DNA that ultimately determines how genes are expressed. Additionally, the environment and age at maturity can influence how traits are expressed or developed over time, but the fundamental blueprint that dictates trait expression is found within the organism's DNA itself.

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The genetic makeup of its parents.

The environment in which it develops.

Its age at maturity.

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