What is malapportionment? When and how did the United States Supreme Court address the issue?

What will be an ideal response?

An ideal response would be:
Malapportionent refers to having legislative districts with unequal populations. The U.S. Supreme Court stepped in. In 1962, in Baker v. Carr, the Court held that voters have standing to challenge legislative apportionment and that the federal courts should consider such questions. Arbitrary and capriciously drawn districts deprive people of their constitutional rights of representation, and federal judges may take jurisdiction over such cases.