Question

question 1-9
the table lists the trials for fruit color where allele r exhibits incomplete dominance over allele r.
genotype phenotype
rr red
rr yellow
rr orange
heterozygous fruit have orange phenotypes. what percent of offspring are expected to have an orange phenotype if the parent plants are orange (rr) and yellow (rr)?
100%
50%
75%
25%

Explanation:

Step1: Identify parent gametes

Orange parent ($RR'$) produces $R$ and $R'$ gametes. Yellow parent ($R'R'$) produces only $R'$ gametes.

Step2: Create Punnett square

$$\begin{array}{c|cc} & R & R' \\ \hline R' & RR' & R'R' \\ R' & RR' & R'R' \\ \end{array}$$

Step3: Count orange offspring genotypes

Orange phenotype = $RR'$. There are 2 out of 4 total genotypes.

Step4: Calculate percentage

$\text{Percentage} = \frac{2}{4} \times 100\% = 50\%$

Answer:

B. 50%