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. lassie, a labrador retriever from this group, has brown fur. lassie has two alleles for brown fur. based on this information, click the blue words to correct any errors in the text. lassie is heterozygous for the fur color gene. lassie’s genotype for the fur color trait is brown fur. lassie’s phenotype for the fur color gene is ff.

Explanation:

1. For "Lassie is heterozygous for the fur color gene": Heterozygous means having two different alleles (e.g., Ff). But Lassie has two alleles for brown fur, so she must be homozygous (ff). So "heterozygous" should be changed to "homozygous".
2. For "Lassie’s genotype for the fur color trait is brown fur": Genotype refers to the genetic makeup (allele combination), not the phenotype (physical trait). Since brown fur is due to allele f (recessive), her genotype should be ff. So "brown fur" (phenotype) is incorrect; it should be "ff".
3. For "Lassie’s phenotype for the fur color gene is FF": Phenotype is the physical trait (brown fur), and FF would be a genotype for black fur (since F is dominant for black). Lassie has brown fur, so her phenotype is brown fur, and her genotype can't be FF. So "FF" (genotype) is incorrect; it should be "brown fur" (phenotype), and her genotype is ff.

Answer:

• "heterozygous" should be changed to "homozygous"
• "brown fur" (in genotype statement) should be changed to "ff"
• "FF" (in phenotype statement) should be changed to "brown fur" (and note genotype is ff)