Final answer:
Approximately 50% of the gametes produced by an individual heterozygous for a translocation will be nonviable.
Step-by-step explanation:
Approximately 50% of the gametes produced by an individual heterozygous for a translocation will be nonviable. This is because a translocation is a chromosomal abnormality that occurs when a segment of one chromosome breaks off and attaches to another chromosome. This can disrupt normal chromosomal segregation during meiosis, resulting in nonviable gametes.