Final answer:
A diploid gamete fertilized by a haploid gamete results in a triploid individual, typically leading to sterility due to abnormal meiosis.
Step-by-step explanation:
The consequence of a diploid gamete (resulting from meiotic nondisjunction) being fertilized by a haploid gamete from the same species would be a triploid individual. This is because the diploid gamete contains two sets of chromosomes due to nondisjunction, and when it combines with a normal haploid gamete (with one set of chromosomes), the resulting zygote will have three sets of chromosomes. This condition, known as triploidy, often results in sterility because meiosis cannot proceed normally with an odd number of chromosome sets. Notably, plants can be more tolerant of polyploidy and may benefit from it.