Question

question 4
9.1 pts
in pea plants flower color is a completely dominant trait with purple flowers being dominant to white flowers. based on this if you crossed two pure bred flowers, one white and one purple, what would be the expected probability of phenotypes in the f2 generation?
100% purple 0% white
50% purple 50% white
75% purple 25% white
25% purple 75% white

Explanation:

Step1: Define Genotypes

Let \( P \) be the dominant allele (purple) and \( p \) be the recessive allele (white). Pure - bred purple has genotype \( PP \), pure - bred white has genotype \( pp \).

Step2: F1 Generation

When crossing \( PP\times pp \), all F1 offspring will have genotype \( Pp \) (since \( P \) from purple and \( p \) from white). Phenotypically, all F1 are purple.

Step3: F2 Generation

Crossing two F1 plants (\( Pp\times Pp \)). Using the Punnett square:

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

The genotypes are \( PP \) (1/4), \( Pp \) (2/4), \( pp \) (1/4). Phenotypically, \( PP \) and \( Pp \) are purple (total 3/4 or 75%) and \( pp \) is white (1/4 or 25%).

Answer:

75% purple 25% white