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diff --git a/src/main/java/org/apache/commons/math3/genetics/ChromosomePair.java b/src/main/java/org/apache/commons/math3/genetics/ChromosomePair.java
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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.commons.math3.genetics;
+
+/**
+ * A pair of {@link Chromosome} objects.
+ *
+ * @since 2.0
+ */
+public class ChromosomePair {
+    /** the first chromosome in the pair. */
+    private final Chromosome first;
+
+    /** the second chromosome in the pair. */
+    private final Chromosome second;
+
+    /**
+     * Create a chromosome pair.
+     *
+     * @param c1 the first chromosome.
+     * @param c2 the second chromosome.
+     */
+    public ChromosomePair(final Chromosome c1, final Chromosome c2) {
+        super();
+        first = c1;
+        second = c2;
+    }
+
+    /**
+     * Access the first chromosome.
+     *
+     * @return the first chromosome.
+     */
+    public Chromosome getFirst() {
+        return first;
+    }
+
+    /**
+     * Access the second chromosome.
+     *
+     * @return the second chromosome.
+     */
+    public Chromosome getSecond() {
+        return second;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String toString() {
+        return String.format("(%s,%s)", getFirst(), getSecond());
+    }
+}