In pea plants, smooth seeds (S) are dominant over wrinkled seeds (S). A cross is made between a wrinkled-seed variety and a heterozygous smooth-seed variety. The chance of getting offspring homozygous for smooth seeds is

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The wrinkled-seed variety must be homozygous recessive (ss) since wrinkled seeds are a recessive trait. The heterozygous smooth-seed variety has the genotype Ss. When these are crossed (Ss x ss), all offspring will have one S allele from the smooth-seed parent and one s allele from the wrinkled-seed parent, resulting in genotypes of Ss. Therefore, it is impossible to get offspring homozygous for smooth seeds (SS) from this cross.

In Pea Plants, Smooth Seeds (S) Are Dominant Over Wrinkled