Question

legend
p = purple flowers
p = white flowers

genotype
phenotype
purebred purple flowered parent
pp
pp
pp
purebred white flowered parent
offspring

Explanation:

To solve for the genotype of the purebred purple - flowered parent, purebred white - flowered parent, and their offspring, we can use the principles of Mendelian genetics (specifically, the concept of homozygous and heterozygous genotypes in a monohybrid cross).

Step 1: Determine the genotype of the purebred purple - flowered parent

A purebred (homozygous) organism has two identical alleles for a particular trait. Since purple flowers are represented by the dominant allele \(P\), a purebred purple - flowered plant will have the genotype \(PP\). This is because in a purebred, both alleles for the flower color trait are the dominant form (there is no recessive allele present to mask the dominant trait, and since it is purebred, the two alleles are the same).

Step 2: Determine the genotype of the purebred white - flowered parent

White flowers are represented by the recessive allele \(p\). A purebred (homozygous) white - flowered plant must have two recessive alleles, so its genotype is \(pp\). This is because for a recessive trait to be expressed in the phenotype, the organism must have two copies of the recessive allele (since the dominant allele would mask the recessive trait if it were present).

Step 3: Determine the genotype of the offspring

When we cross a purebred purple - flowered plant (\(PP\)) with a purebred white - flowered plant (\(pp\)), we can use a Punnett square to find the genotype of the offspring. The \(PP\) parent will produce gametes with the allele \(P\), and the \(pp\) parent will produce gametes with the allele \(p\). When we combine these gametes, all of the offspring will have the genotype \(Pp\). This is because each offspring receives one allele from each parent: one \(P\) from the purple - flowered parent and one \(p\) from the white - flowered parent.

Genotype and Phenotype Summary:

• Purebred Purple - Flowered Parent:
• Genotype: \(PP\)
• Phenotype: Purple flowers (since the dominant allele \(P\) is present and expressed)
• Purebred White - Flowered Parent:
• Genotype: \(pp\)
• Phenotype: White flowers (since the recessive allele \(p\) is expressed in the homozygous state)
• Offspring:
• Genotype: \(Pp\)
• Phenotype: Purple flowers (since the dominant allele \(P\) masks the recessive allele \(p\))

Answer:

To solve for the genotype of the purebred purple - flowered parent, purebred white - flowered parent, and their offspring, we can use the principles of Mendelian genetics (specifically, the concept of homozygous and heterozygous genotypes in a monohybrid cross).

Step 1: Determine the genotype of the purebred purple - flowered parent

A purebred (homozygous) organism has two identical alleles for a particular trait. Since purple flowers are represented by the dominant allele \(P\), a purebred purple - flowered plant will have the genotype \(PP\). This is because in a purebred, both alleles for the flower color trait are the dominant form (there is no recessive allele present to mask the dominant trait, and since it is purebred, the two alleles are the same).

Step 2: Determine the genotype of the purebred white - flowered parent

White flowers are represented by the recessive allele \(p\). A purebred (homozygous) white - flowered plant must have two recessive alleles, so its genotype is \(pp\). This is because for a recessive trait to be expressed in the phenotype, the organism must have two copies of the recessive allele (since the dominant allele would mask the recessive trait if it were present).

Step 3: Determine the genotype of the offspring

When we cross a purebred purple - flowered plant (\(PP\)) with a purebred white - flowered plant (\(pp\)), we can use a Punnett square to find the genotype of the offspring. The \(PP\) parent will produce gametes with the allele \(P\), and the \(pp\) parent will produce gametes with the allele \(p\). When we combine these gametes, all of the offspring will have the genotype \(Pp\). This is because each offspring receives one allele from each parent: one \(P\) from the purple - flowered parent and one \(p\) from the white - flowered parent.

Genotype and Phenotype Summary:

• Purebred Purple - Flowered Parent:
• Genotype: \(PP\)
• Phenotype: Purple flowers (since the dominant allele \(P\) is present and expressed)
• Purebred White - Flowered Parent:
• Genotype: \(pp\)
• Phenotype: White flowers (since the recessive allele \(p\) is expressed in the homozygous state)
• Offspring:
• Genotype: \(Pp\)
• Phenotype: Purple flowers (since the dominant allele \(P\) masks the recessive allele \(p\))