Question

purple petal color in pea plants is dominant to white petal color. two heterozygous pea plants are crossed. what is the ratio of the offspring with white petals to the total number of offspring? : express this in a percentage. %

Explanation:

Step1: Determine the genotypes of the parents

The parents are heterozygous. Let \(D\) represent the dominant allele (purple petals) and \(d\) represent the recessive allele (white petals). So the genotype of each parent is \(Dd\).

Step2: Create a Punnett square

	\(D\)	\(d\)
\(d\)	\(Dd\)	\(dd\)

Step3: Analyze the offspring genotypes

The genotypes of the offspring are \(DD\), \(Dd\), \(Dd\), \(dd\).

Step4: Identify white - petal offspring

Only the \(dd\) genotype results in white petals. There is \(1\) \(dd\) out of \(4\) total offspring.

Step5: Calculate the ratio and percentage

The ratio of white - petal offspring to total offspring is \(1:4\). To convert to a percentage, use the formula \(\frac{1}{4}\times100\%\).

$$ \frac{1}{4}\times100\% = 25\% $$

Answer:

\(1:4\); \(25\%\)