A cross is made between double heterozygous genotypes, like a Mendelian F 1 x F

Question

A cross is made between double heterozygous genotypes, like a Mendelian F1 x F1 (e.g. AaBb x AaBb).

Both of the genes involved in the dihybrid cross described above have been identified molecularly with DNA distinctions between their respective alleles.

This gel diagram shows the DNA banding patterns observed among the F2 progeny of the Mendelian F1 x F1 cross. The parental samples are shown on the left (P1 and P2). On the right are shown all of the different patterns of bands observed among the F2 progeny. (Remember: The two pairs of alleles assort independenty.)

Note: These gels indicate only the sizes of the DNA fragments represented. There's no information about the relative amounts: The thickness of all bands has been drawn the same for simplifying the analysis.

What fraction of the F2 progeny would be expected to show pattern D?

Enter your answer as a fraction.

Explanation / Answer

Pattern D shows a heterozygous dominant condition hence, its fraction would be 9:16 in a dihybrid cross with alleles under independent assortment.

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