Biology Regents Practice Exam 2025 – The All-in-One Guide to Master Your Regents!

Question: 1 / 400

How can the external environment affect gene expression in organisms?

It determines the number of offspring produced

It influences the distribution of genes within a population

It can change the fur color of animals based on temperature

The correct choice highlights how external environmental factors can directly influence gene expression rather than altering the DNA sequence itself. In many organisms, environmental cues such as temperature play a critical role in determining physical traits through the regulation of gene activity. For instance, some animals exhibit seasonal changes in fur color—darker fur in winter for camouflage and lighter fur in summer for heat regulation—due to changes in gene expression triggered by temperature fluctuations.

This highlights how the environment can regulate which genes are turned on or off, leading to adaptations that help organisms survive and thrive in their specific habitats. The other choices speak to different biological concepts, such as reproductive strategies and population dynamics, but do not specifically address how the external environment impacts the molecular mechanisms involved in gene expression.

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It alters the overall DNA sequence

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