Final answer:
With linked genes, only nonrecombinant progeny are produced. This was observed in Thomas Morgan's 1912 experiment.
Step-by-step explanation:
With linked genes, only nonrecombinant progeny are produced. Nonrecombinant progeny have the same allele combinations as their parents. This was observed in Thomas Morgan's 1912 experiment, where heterozygous individuals that were test crossed to a homozygous recessive parent produced both parental and nonparental types of progeny.