purple petal color in pea plants is dominant to white petal color. two heterozygous pea plants are crossed…

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.

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.

Answer

Explanation:

Step1: Set up the cross

Let the dominant allele for purple be D and the recessive allele for white be d. Heterozygous plants have the genotype Dd. When Dd x Dd, we use a Punnett - square.

Step2: Analyze the Punnett - square results

The genotypes from the Dd x Dd cross are DD : Dd : dd in a ratio of 1:2:1. The dd genotype results in white - petaled offspring.

Step3: Calculate the ratio and percentage

The ratio of white - petaled (dd) offspring to the total number of offspring is 1 out of 4, or $\frac{1}{4}$. To convert to a percentage, we use the formula $\text{Percentage}=\frac{\text{Number of white - petaled offspring}}{\text{Total number of offspring}}\times100%$. So, $\frac{1}{4}\times100% = 25%$.

Answer:

Ratio: $\frac{1}{4}$ Percentage: 25%