In a hybrid cross of 556 round green and wrinkled yellow seeds, ____ seeds are round and yellow.
315
In Mendel's classical dihybrid cross between round yellow and wrinkled green seeds of the garden pea, the F2 generation shows the four phenotypes in the ratio 9 : 3 : 3 : 1 for round-yellow : round-green : wrinkled-yellow : wrinkled-green respectively.
The total number of F2 seeds here is \(556\). Out of every 16 seeds, 9 are round and yellow. So the expected number of round yellow seeds is \(\dfrac{9}{16} \times 556 = \dfrac{5004}{16} \approx 312.75\), which rounds to \(315\) seeds, the value Mendel actually reported.
The remaining classes correspond to about 108 (round-green), 101 (wrinkled-yellow) and 32 (wrinkled-green).
Hence, 315.
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