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In a test cross involving F1 dihybrid flies, more parental type offspring were produced than the recombinant type offspring. This indicates

1. the two genes are located on two different chromosomes.
2. chromosomes failed to separate during meiosis.
3. the two genes are linked and present on the same chromosome.
4. both of the characters are controlled by more than one gene.

Correct answer: the two genes are linked and present on the same chromosome.

Solution

When a test cross produces more parental than recombinant offspring, the two genes are not assorting independently. This pattern is evidence that the genes are linked, meaning they are on the same chromosome and tend to be inherited together.

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