To solve this problem, let's break it down into two parts:
1. Possibility that the offspring from a PP x pp cross will have purple flowers:
- Genotype of parents:
- One parent has the genotype PP (homozygous dominant for purple flowers).
- The other parent has the genotype pp (homozygous recessive for white flowers).
- Cross result:
- When we cross PP with pp, all offspring will receive one allele from each parent, resulting in the genotype Pp for all offspring.
- Since the P allele is dominant over the p allele, all offspring will have purple flowers.
- Conclusion:
- The possibility that the offspring will have purple flowers is 100%.
2. Possibility of homozygous dominant genotype (PP) for an offspring from a Pp x pp cross:
- Genotype of parents:
- One offspring from the first cross has the genotype Pp.
- This Pp offspring mates with another plant that has the genotype pp.
- Punnett Square for Pp x pp:
[tex]\[
\begin{tabular}{|c|c|c|}
\hline & P & p \\
\hline p & Pp & pp \\
\hline p & Pp & pp \\
\hline
\end{tabular}
\][/tex]
- Analysis of results:
- The possible offspring genotypes are: Pp (purple flowers) and pp (white flowers).
- However, there is no possibility for an offspring with a genotype of PP (homozygous dominant) from this cross.
- Conclusion:
- The possibility of homozygous dominant genotype (PP) for the flowers is 0%.
Putting it all together:
- The possibility that the offspring will have purple flowers from the first cross is 100%.
- The possibility of homozygous dominant genotype for the flowers in the second cross is 0%.
