Final answer:
The constitutional clause common to both Grutter v. Bollinger and Brown v. Board of Education is the Equal Protection Clause of the Fourteenth Amendment.
Step-by-step explanation:
The constitutional clause that is common to both Grutter v. Bollinger (2003) and Brown v. Board of Education (1954) is the Equal Protection Clause of the Fourteenth Amendment. The Equal Protection Clause states that no state shall deny any person within its jurisdiction the equal protection of the laws. In both cases, the Supreme Court determined that the policies and practices being challenged violated the equal protection rights of the plaintiffs.