Suppose a gardener wants to plant pea which should be of the dwarf varieties. What do you suggest for the choice of the parent plant seeds by the gardener?

Correct option is D

Correct Answer: D All seeds should be of dwarf varieties.

Explanation:
If a gardener wants to grow only dwarf pea plants, they must ensure that the seeds used are from parent plants that are homozygous recessive for the dwarf trait. In peas, the height trait is determined by a single gene with two alleles:

• T (dominant allele) for tallness
• t (recessive allele) for dwarfness

For a plant to exhibit the dwarf phenotype, it must have the genotype tt. If seeds from tall varieties or mixed varieties are used, there is a possibility of dominant tall alleles being present, leading to the growth of tall plants. Therefore, only seeds from plants that are homozygous recessive (dwarf plants) should be chosen.

Key Points Supporting the Answer:

1. Tallness is a dominant trait, so if seeds carry the T allele, tall plants may grow.
2. Dwarfness is a recessive trait, requiring both alleles to be t (homozygous recessive) for dwarf plants to appear.
3. Mixed varieties or random seeds may carry dominant T alleles, leading to an unpredictable result.
4. Selecting seeds from known dwarf parent plants ensures uniformity and desired outcomes in the garden.