Question

question 48
why do genetically identical organisms sometimes look different?
a they do not consume enough nutrients to show their genes
b environmental conditions affect how genes are expressed
c mutations always occur during development
d dna changes dramatically after childhood

Explanation:

To determine why genetically identical organisms can look different, we analyze each option:

• Option a: Nutrient consumption doesn't directly relate to gene expression differences in identical organisms.
• Option b: Environmental conditions (like temperature, nutrients, etc.) can affect gene expression, leading to phenotypic differences even in genetically identical organisms (e.g., epigenetic changes due to environment).
• Option c: Mutations don't always occur during development, and even if they did, genetically identical organisms start with the same DNA, so mutations aren't the primary reason for initial differences.
• Option d: DNA changes after childhood aren't a typical or primary reason for phenotypic differences in genetically identical organisms.

So the correct answer is related to environmental effects on gene expression.

Answer:

b. Environmental conditions affect how genes are expressed