Answer:
heredity
Explanation:
The odd one out among these terms is "heredity." The other terms—mutation, polyploidy, and crossing over—are all related to genetic processes and variations that occur during reproduction and can lead to genetic diversity.
Mutation refers to a change in the DNA sequence that can result in new traits or characteristics.
Polyploidy is a condition where an organism has more than two sets of chromosomes, often resulting from errors in cell division.
Crossing over is a process during meiosis where homologous chromosomes exchange genetic material.
On the other hand, "heredity" refers to the passing on of traits from parents to offspring through genetic information (DNA). Therefore, "heredity" is the odd one out in this group of terms related to genetic processes.