Topic: Chromosome theory, linkage and crossing over· Genetics and Evolution

In a testcross involving F_1 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.

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 1 Practice test neet Save WhatsApp Report

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Answer: 3. The two genes are linked and present on the same chromosome.

In a testcross with an F₁ dihybrid, independent assortment gives 1:1:1:1. When parental types are far more frequent than recombinants, the genes are linked on the same chromosome, and only a few recombinants arise by crossing over.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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In a testcross involving F_1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates :

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