Question

purple flowers are dominant over white flowers. a heterozygous purple flower is crossed with another heterozygous purple flower. what will the ratio of purple to white be? 3:1 1:3 2:2 4:0

Explanation:

Step1: Determine the genotypes

Let \(P\) represent the dominant allele (purple) and \(p\) represent the recessive allele (white). A heterozygous purple flower has the genotype \(Pp\).

Step2: Set up the Punnett square

When crossing \(Pp\times Pp\), the possible gametes from each parent are \(P\) and \(p\). The Punnett square is:

	\(P\)	\(p\)
\(p\)	\(Pp\)	\(pp\)

Step3: Analyze the genotypes and phenotypes

• \(PP\) (purple): \(\frac{1}{4}\)
• \(Pp\) (purple): \(\frac{2}{4}\)
• \(pp\) (white): \(\frac{1}{4}\)

The total number of purple - flowered offspring (\(PP + Pp\)) is \(\frac{1}{4}+\frac{2}{4}=\frac{3}{4}\), and the number of white - flowered offspring (\(pp\)) is \(\frac{1}{4}\)

Answer:

A. \(3:1\)