Question

13 multiple choice 1 point
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?
25% purple 75% white
75% purple 25% white
100% purple 0% white
50% purple 50% white
14 multiple choice 1 point
in japanese 4 oclock flowers, petal color is incompletely dominant with petals either being red, white, or pink. if you cross two heterozygous plants. what is the probability of an offspring expressing the white phenotype?
0%
25%
50%
75%

Explanation:

Step1: Define parental genotypes (Q13)

Pure purple: $PP$, pure white: $pp$

Step2: F1 generation cross (Q13)

$PP \times pp$ → All $Pp$ (purple phenotype)

Step3: F2 generation cross (Q13)

$Pp \times Pp$ → Offspring genotypes: $1PP:2Pp:1pp$. Purple ($PP,Pp$) = 75%, white ($pp$) = 25%

Step4: Define heterozygous genotype (Q14)

In incomplete dominance, heterozygous = $RW$ (pink), white = $WW$, red = $RR$

Step5: Cross heterozygous plants (Q14)

$RW \times RW$ → Offspring genotypes: $1RR:2RW:1WW$. White ($WW$) = 25%

Answer:

1. 75% purple 25% white
2. 25%