If all cells of a plant have identical DNA, then why are there different cell types and tissues within a plant?
A) Different subsets of the information are used in each type of cell.
B) Internal environmental conditions may determine which subset of the genome is expressed.
C) Hormones and other growth regulators may control gene expression.
D) External environmental conditions such as light or dark may alter gene expression.
E) All of these may influence the expression of different subsets of genetic information from the genome, resulting in differentiation and development.

Question

Quizplus · Accepted Answer

All the options (A, B, C, D) collectively explain how different cell types and tissues can arise within a plant despite all cells having identical DNA. This differentiation is due to the selective expression of different subsets of genes influenced by internal and external factors, hormones, and environmental conditions.

If All Cells of a Plant Have Identical DNA, Then