Question on: JAMB Biology - 2024
In a cross involving a heterozygous red flower plant (Rr) and a white flowered plant (rr). What is the probability that the offspring will be Rr?
A
\(\frac{1}{2}\)
B
1
C
2
D
\(\frac{1}{4}\)
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Correct Option: A
Here's how to solve this genetics problem using a Punnett square:
- Identify the genotypes of the parents:
- Parent 1: Heterozygous red flower (Rr)
- Parent 2: White flower (rr)
- Set up the Punnett square:\[\begin{array}{|c|c|c|} \hline & \mathbf{R} & \mathbf{r} \\ \hline \mathbf{r} & \text{Rr} & \text{rr} \\ \hline \mathbf{r} & \text{Rr} & \text{rr} \\ \hline \end{array}\]
- Determine the genotypes of the offspring:
- Two possible genotypes are Rr (red flower)
- Two possible genotypes are rr (white flower)
- Calculate the probability of Rr offspring:
- There are 2 Rr offspring out of a total of 4 possible offspring.
- Probability = \(\frac{2}{4} = \frac{1}{2}\)
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