College

We appreciate your visit to Refer to the following information to answer this question A horticulturalist wants to produce geraniums with specific characteristics She knows that the trait of red. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!

Refer to the following information to answer this question:

A horticulturalist wants to produce geraniums with specific characteristics. She knows that the trait of red flowers is governed by the allele [tex]R[/tex] ([tex]RR[/tex] and [tex]Rr[/tex]) and the trait of white flowers is governed by the allele [tex]r[/tex] ([tex]rr[/tex]).

The horticulturalist crosses two geraniums from the F1 generation. Look at the Punnett square to see this cross. What ratio of red-to-white-flowering plants would you expect to see in the phenotypes of the F2 generation?

[tex]
\[
\begin{array}{|c|c|c|}
\hline
& R & r \\
\hline
R & RR & Rr \\
\hline
r & Rr & rr \\
\hline
\end{array}
\]
[/tex]

Answer :

Sure! Let's walk through this step-by-step to determine the expected ratio of red to white flowering plants in the F2 generation.

1. Genetic Background:
- The trait for red flowers is governed by the allele [tex]\( R \)[/tex].
- If a plant has the genotype [tex]\( RR \)[/tex] or [tex]\( Rr \)[/tex], it will have red flowers.
- The trait for white flowers is governed by the allele [tex]\( r \)[/tex].
- A plant will have white flowers only if it has the genotype [tex]\( rr \)[/tex].

2. Cross of Two F1 Geraniums:
- The horticulturalist is crossing two geraniums both from the F1 generation with genotype [tex]\( Rr \)[/tex].

3. Punnett Square:
- The Punnett Square for this cross looks like this:

| | [tex]\( R \)[/tex] | [tex]\( r \)[/tex] |
|-------|---------|---------|
| R | [tex]\( RR \)[/tex] | [tex]\( Rr \)[/tex] |
| r | [tex]\( Rr \)[/tex] | [tex]\( rr \)[/tex] |

4. Determine the Genotypes:
- From the Punnett Square, we see the following combinations of genotypes:
- [tex]\( RR \)[/tex]: One occurrence
- [tex]\( Rr \)[/tex]: Two occurrences
- [tex]\( rr \)[/tex]: One occurrence

5. Identify the Phenotypes:
- Red flowers:
- Produced by genotypes [tex]\( RR \)[/tex] and [tex]\( Rr \)[/tex].
- We have 1 [tex]\( RR \)[/tex] and 2 [tex]\( Rr \)[/tex] for a total of 3 red flowering plants.
- White flowers:
- Produced by the genotype [tex]\( rr \)[/tex].
- We have 1 [tex]\( rr \)[/tex].

6. Calculate the Expected Ratio:
- The expected ratio of red to white flowering plants is 3:1.

Therefore, for every four plants, we expect 3 to have red flowers and 1 to have white flowers in the F2 generation.

Thanks for taking the time to read Refer to the following information to answer this question A horticulturalist wants to produce geraniums with specific characteristics She knows that the trait of red. We hope the insights shared have been valuable and enhanced your understanding of the topic. Don�t hesitate to browse our website for more informative and engaging content!

Rewritten by : Barada