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Questions and Answers
What defines a genotype?
What defines a genotype?
The phenotype of an organism can consist of more than two possible expressions.
The phenotype of an organism can consist of more than two possible expressions.
False
What are the possible genotypes for the eye color trait described?
What are the possible genotypes for the eye color trait described?
BB, Bb, bb
A homozygous genotype for blue eyes is represented as _____
A homozygous genotype for blue eyes is represented as _____
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Match the following definitions with their corresponding terms:
Match the following definitions with their corresponding terms:
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What characterizes a phenotype in genetics?
What characterizes a phenotype in genetics?
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Which of the following genotypes will always result in the phenotype of green eyes?
Which of the following genotypes will always result in the phenotype of green eyes?
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If an organism has the genotype Bb, what is the possible phenotype?
If an organism has the genotype Bb, what is the possible phenotype?
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In the provided example, which genotype represents homozygous for blue eyes?
In the provided example, which genotype represents homozygous for blue eyes?
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How many potential genotypes are there for the eye color trait described?
How many potential genotypes are there for the eye color trait described?
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Study Notes
Genotype vs Phenotype
- Genotype refers to the specific combination of alleles an organism possesses.
- Alleles are alternative forms of a gene.
- For example, if B represents the allele for blue eyes and b represents the allele for green eyes, possible genotypes include BB, Bb, and bb.
- Phenotype, on the other hand, refers to the observable characteristics of an organism, such as eye color.
- It is the expression of the genotype.
- The genotype BB and Bb both result in the blue eye phenotype because B is dominant to b.
- This means that only one copy of the B allele is needed for blue eyes to be expressed.
- The bb genotype results in the green eye phenotype because b is recessive, meaning two copies are needed for it to be expressed.
Genotype
- Genotype refers to the specific combination of alleles an organism possesses for a particular trait.
- Alleles are alternative forms of a gene, each with a specific DNA sequence.
- For example:
- B represents the allele for blue eyes.
- b represents the allele for green eyes.
- Possible genotypes include BB, Bb, and bb.
Phenotype
- Phenotype refers to the observable characteristics or traits of an organism.
- It is the expression of the genotype.
- For example:
- The phenotype for eye color is either blue or green.
- Both genotypes BB and Bb result in the blue eye phenotype, as the dominant B allele masks the recessive b allele.
- The distinction between genotype and phenotype highlights the concept of dominant and recessive alleles.
- Dominant alleles express their phenotype regardless of the other allele present.
- Recessive alleles are only expressed when paired with another recessive allele.
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Description
Test your understanding of the differences between genotype and phenotype. This quiz covers the definitions, examples, and relationships between alleles and observable characteristics. Challenge yourself to grasp how these concepts impact traits in organisms.
