Question

in a group of labrador retrievers, some individuals have black fur and others have brown fur. in this group, the gene for the fur color trait has two alleles. the allele f is for black fur, and the allele f is for brown fur.
rover, a labrador retriever from this group, has black fur. rover has two alleles for black fur.
based on this information, click the blue words to correct any errors in the text.
rover is heterozygous for the fur color gene.
rovers genotype for the fur color gene is ff.
rovers genotype for the fur color trait is brown fur.

Explanation:

1. For "Rover is heterozygous for the fur color gene": Heterozygous means having two different alleles (e.g., Ff). But Rover has two alleles for black fur (FF), so he is homozygous dominant. So "heterozygous" should be corrected to "homozygous".
2. For "Rover's genotype for the fur color gene is Ff": Rover has two alleles for black fur, and F is the allele for black fur. So his genotype should be FF (homozygous dominant), not Ff (heterozygous). Wait, no—wait, the original text says "Rover has two alleles for black fur". The allele for black is F, so if he has two F alleles, his genotype is FF. But the blue word here is "Ff"—so we need to correct "Ff" to "FF"? Wait, no, let's re - read. The problem says "Rover has two alleles for black fur". The allele for black is F, so his genotype is FF (homozygous for F). So the error here is "Ff"—it should be "FF"? Wait, no, the blue word is "Ff", so we correct "Ff" to "FF".
3. For "Rover's genotype for the fur color trait is brown fur": Genotype refers to the alleles (e.g., FF, Ff, ff), while phenotype refers to the physical trait (like brown fur or black fur). Rover has black fur, and his genotype is related to the alleles. So "brown fur" (a phenotype) is incorrect here. Also, his genotype is for the gene, and his phenotype is black fur. But the blue words are "genotype" and "brown fur"? Wait, the sentence is "Rover's genotype for the fur color trait is brown fur". Genotype can't be a phenotype (brown fur). Also, Rover has black fur, so his phenotype is black fur. But the error is in the terms: "genotype" should maybe be "phenotype", and "brown fur" should be "black fur". But let's go step by step.

First sentence correction: "heterozygous" → "homozygous" (because homozygous means having two identical alleles, and Rover has two F alleles).

Second sentence: The original blue word is "Ff"—since Rover has two F alleles, his genotype is FF, so "Ff" → "FF".

Third sentence: "genotype" is incorrect (it should be "phenotype") and "brown fur" is incorrect (it should be "black fur"). But the blue words are "genotype" and "brown fur". So we need to correct "genotype" to "phenotype" and "brown fur" to "black fur"? Wait, the problem says "click the blue words to correct any errors". Let's identify the blue words:

In the first sentence: "heterozygous" is blue.

In the second sentence: "Ff" is blue.

In the third sentence: "genotype" and "brown fur" are blue? Wait, the image shows:

• "Rover is heterozygous for the fur color gene." (blue word: heterozygous)
• "Rover's genotype for the fur color gene is Ff." (blue word: Ff)
• "Rover's genotype for the fur color trait is brown fur." (blue words: genotype, brown fur)

So corrections:

1. "heterozygous" → "homozygous" (because homozygous dominant: two same dominant alleles, Rover has two F alleles)
2. "Ff" → "FF" (since Rover has two F alleles)
3. "genotype" → "phenotype" (because phenotype is the physical trait, and "brown fur" → "black fur" (since Rover has black fur))

But let's focus on the blue words:

First correction: "heterozygous" to "homozygous" (as homozygous means having two identical alleles, and Rover has two F alleles, so he's homozygous for the black fur allele)

Second correction: "Ff" to "FF" (Rover has two F alleles, so genotype is FF)

Third correction: "genotype" to "phenotype" (because genotype is the genetic makeup, phenotype is the physical trait) and "brown fur" to "black fur" (Rover has black fur, so his phenotype is black fur)

Answer:

1. "heterozygous" → "homozygous"
2. "Ff" → "FF"
3. "genotype" → "phenotype" and "brown fur" → "black fur" (or for the third sentence, since the blue words are "genotype" and "brown fur", correct "genotype" to "phenotype" and "brown fur" to "black fur")