Final answer:
Unequal crossing over can produce both duplication and deletion chromosome mutations.
Step-by-step explanation:
Unequal crossing over produces both a) Duplication and b) Deletion chromosome mutations.
During meiosis, crossing over can occur between homologous chromosomes. When the chromosomes exchange genetic material, sometimes the exchange is unequal, resulting in one chromosome receiving more genetic material than the other. This can lead to the duplication of certain genes on one chromosome and the deletion of certain genes on the other chromosome, resulting in duplication and deletion chromosome mutations.