Question

in violets, purple flowers are dominant over white flowers. after breeding two violets, you observe three purple - flowered plants and one white - flowered plant. which of the following is the genotype of the white - flowered plant?

tt

tt

tt

Explanation:

Step1: Recall dominance - recessive rule

In genetics, a recessive trait is only expressed when an organism has two copies of the recessive allele. Since white - flowered is the recessive trait in violets (purple is dominant).

Step2: Analyze genotypes

Let the dominant allele for purple be represented by 'T' and the recessive allele for white be 't'. A white - flowered plant must have the genotype 'tt' because it needs two recessive alleles to show the white - flowered phenotype.

Answer:

tt