JAMB - Biology (1993 - No. 44)
In the illustration above, the genotypes of the offsprings are
1 heterozygous smooth : 2 homozygous smooth : 1 wrinkled
1 homozygous smooth : 2 heterozygous smooth : 1 wrinkled
2 homozygous smooth : 2 wrinkled
3 heterozygous smooth : 2 wrinkled
Explanation
The diagram above refers to a PUNNETT SQUARE used in predicting the probable genotypic and phenotypic ratios of a cross. looking at the diagram, we have the ratio
SS : Ss : sS : ss and from the question, we see the genotypic composition is;
1 homozygous smooth : 2 heterozygous smooth : 1 wrinkled
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