Question

Choose the correct answer from the alternatives given.
One pure strain of pea plants developed by Mendel had yellow seeds and another strain had green seeds. All the offsprings from crosses between these two parental strains of plants had yellow seeds. In these plants, the allele for yellow seed colour is

• A. recessive to the allele for green colour
• B. dominant over the allele for green colour
• C. epistatic over other alleles
• D. expressed only in gametes

Answer 1

The correct option is B dominant over the allele for green colour

since the two strains mated were pure, both of them must be homozygous for their seed colour. Homozygous individuals for two different colours when mated will result in the offsprings having a heterozygous genotype. In this case, since the yellow seed colour masks the effect of the green seed colour and only the yellow colour is seen in the phenotype of the offsprings, it must be the dominant phenotype over the green seed colour. So, the correct option is 'dominant over the allele for green colour'.