Question

put it all together: (remember to follow the steps provided in your notes)
the following segment of dna was extracted from the gametes of a gorilla.
original: tta- gcg- act- tat
mutated: tta- ggg- act- tat
which of the following applies to this mutation?

○ this mutation is genotypic because it is in a gamete
○ this mutation is genotypic because the amino acid changed
○ this mutation is phenotypic because there was a change in the dna sequence
○ this mutation is phenotypic because the amino acid changed

Explanation:

1. First, recall the definitions: Genotype refers to the genetic makeup (DNA sequence), phenotype is the observable trait. Mutations in gametes affect genotype.
2. Analyze the DNA change: Original GCG (a codon) becomes GGG. This is a DNA (genetic) change, so it's genotypic.
3. Evaluate options:

• Option 1: Gamete mutations are genotypic (as they affect DNA, the genotype).
• Option 2: The reason here is wrong (amino acid change isn't the reason for genotypic; genotypic is about DNA).
• Option 3: Phenotypic is about traits, not DNA sequence change.
• Option 4: Phenotypic is not about amino acid change in this context (and the reasoning is wrong).

So the correct option is the first one.

Answer:

A. This mutation is genotypic because it is in a gamete