Question

1. in a group of nile tilapia fish, some individuals have a greenish-brown body and others have a pink body. in this group, the gene for the body color trait has two alleles. the allele b is for a greenish-brown body, and the allele b is for a pink body.
2. a certain nile tilapia fish from this group has a greenish-brown body. this fish has two alleles for a greenish-brown body.
3. based on this information, click the blue words to correct any errors in the text.
4. this nile tilapia fish is homozygous for the body color gene.

this nile tilapia fishs phenotype for the body color gene is bb.
this nile tilapia fishs genotype for the body color trait is a pink body.

Explanation:

1. The first statement correctly identifies the fish with two identical dominant alleles (BB) as homozygous, so no correction is needed here.
2. Phenotype refers to the observable physical trait, while genotype is the genetic makeup. The fish's observable trait is a greenish-brown body, and BB is its genotype, so "BB" and "a greenish-brown body" need to be swapped between the second and third statements.
3. The third statement incorrectly lists the phenotype as the genotype; it should instead state the observable trait (greenish-brown body) after correcting the mix-up with the genotype.

Answer:

• This Nile tilapia fish is homozygous for the body color gene. (No correction needed)
• This Nile tilapia fish's phenotype for the body color gene is a greenish-brown body.
• This Nile tilapia fish's genotype for the body color trait is BB.