A guinea pig has red eyes which is a recessive condition. It’s eye color alleles are lowercase B lowercase B in this example lowercase B lowercase B is it a genotype B variant trait, C phenotype or D mutation
The correct answer and explanation is:
Correct Answer: A. Genotype
Explanation (300 words):
In genetics, genotype refers to the specific combination of alleles that an organism carries for a particular trait. In this example, the guinea pig has red eyes, a recessive trait, which is represented by the alleles bb (lowercase b from each parent). Since both alleles are recessive and the same, this genotype is called homozygous recessive.
Here’s a breakdown of the options:
- A. Genotype – ✔️ Correct. The genotype is the genetic makeup, or combination of alleles, such as bb. This genotype leads to the expression of the red eye trait in the guinea pig.
- B. Variant trait – ❌ Incorrect. A variant trait refers more to a trait that differs from the typical or most common expression. While red eyes might be a variant phenotype, the question is about the alleles (bb), which are part of the genotype, not the trait itself.
- C. Phenotype – ❌ Incorrect. The phenotype is the observable characteristic, in this case, red eyes. But bb refers to the underlying genetic code, not the observed trait.
- D. Mutation – ❌ Incorrect. A mutation is a change in the DNA sequence. While it’s possible the b allele originated from a mutation long ago, in this context bb simply represents a pair of inherited normal recessive alleles, not an active mutation.
To sum up:
- The genotype is bb (the alleles the guinea pig carries).
- The phenotype is red eyes (the trait we observe).
- The fact that the trait is recessive means both alleles must be recessive for the trait to appear.
So, the correct and best answer is A. Genotype.