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Answer :
To determine the expected ratio of red-to-white flowering plants when crossing two geraniums from the F1 generation, let's examine the provided Punnett square.
The parent genotypes used for this cross are:
- One parent is Rr (heterozygous with one dominant red allele (R) and one recessive white allele (r)).
- The other parent is rr (homozygous recessive with two white alleles).
Based on the Punnett square, the possible offspring genotypes are:
- Rr (produces red flowers due to the presence of one dominant allele) - There are 2 squares with this genotype.
- rr (produces white flowers due to the absence of the dominant R allele) - There are 2 squares with this genotype.
Now let's look at the phenotypes:
- Plants with the genotype Rr will have red flowers.
- Plants with the genotype rr will have white flowers.
Counting the occurrences:
- There are 2 Rr offspring, showing red flowers.
- There are 2 rr offspring, showing white flowers.
The ratio of red-to-white flowering plants is therefore 2 red to 2 white, which simplifies further to a 1:1 ratio, but based on the choice given, it is noted as 2 red to 2 white.
The parent genotypes used for this cross are:
- One parent is Rr (heterozygous with one dominant red allele (R) and one recessive white allele (r)).
- The other parent is rr (homozygous recessive with two white alleles).
Based on the Punnett square, the possible offspring genotypes are:
- Rr (produces red flowers due to the presence of one dominant allele) - There are 2 squares with this genotype.
- rr (produces white flowers due to the absence of the dominant R allele) - There are 2 squares with this genotype.
Now let's look at the phenotypes:
- Plants with the genotype Rr will have red flowers.
- Plants with the genotype rr will have white flowers.
Counting the occurrences:
- There are 2 Rr offspring, showing red flowers.
- There are 2 rr offspring, showing white flowers.
The ratio of red-to-white flowering plants is therefore 2 red to 2 white, which simplifies further to a 1:1 ratio, but based on the choice given, it is noted as 2 red to 2 white.
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