Podcast
Questions and Answers
What is an allele?
What is an allele?
- Section of DNA that codes for a protein
- The actual alleles an individual inherited
- A version of a gene (correct)
- A physical trait expressed
What does it mean if an allele is dominant?
What does it mean if an allele is dominant?
An allele that is always expressed if present.
What is a recessive allele?
What is a recessive allele?
Allele that is only expressed in the homozygous state.
What does homozygous mean?
What does homozygous mean?
What does heterozygous mean?
What does heterozygous mean?
What is genotype?
What is genotype?
What is phenotype?
What is phenotype?
What is a gene?
What is a gene?
What are homozygous dominant genotypes?
What are homozygous dominant genotypes?
What are heterozygous genotypes?
What are heterozygous genotypes?
What are homozygous recessive genotypes?
What are homozygous recessive genotypes?
Which genotypes would result in the dominant phenotype being expressed?
Which genotypes would result in the dominant phenotype being expressed?
Which genotypes would result in the recessive phenotype being expressed?
Which genotypes would result in the recessive phenotype being expressed?
Flashcards
Allele
Allele
A version of a gene
Dominant Allele
Dominant Allele
An allele that is always expressed if present
Recessive Allele
Recessive Allele
Allele expressed only in homozygous state
Homozygous
Homozygous
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Heterozygous
Heterozygous
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Genotype
Genotype
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Phenotype
Phenotype
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Gene
Gene
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Homozygous Dominant Genotype
Homozygous Dominant Genotype
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Heterozygous Genotype
Heterozygous Genotype
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Homozygous Recessive Genotype
Homozygous Recessive Genotype
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Dominant Phenotype
Dominant Phenotype
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Recessive Phenotype
Recessive Phenotype
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Study Notes
Key Genetic Terms
- Allele: Different versions of a gene that contribute to genetic variation.
- Dominant Allele: An allele that will mask the presence of another allele if present; always expressed in the phenotype.
- Recessive Allele: An allele that is only expressed phenotypically when in a homozygous condition, meaning two copies are present.
Genotype and Phenotype
- Homozygous: Refers to when both alleles at a gene locus are identical, e.g., AA or aa.
- Heterozygous: Refers to when the alleles at a gene locus are different, e.g., Aa.
- Genotype: The specific set of alleles inherited by an individual, which may include homozygous or heterozygous combinations.
- Phenotype: The observable physical traits resulting from the interaction of the genotype with the environment.
Genetics Basics
- Gene: A unit of heredity composed of DNA that governs specific traits by coding for proteins.
- Homozygous Dominant Genotypes: Combinations such as AA or CC where the dominant alleles are present.
- Heterozygous Genotypes: Combinations like Bb or Ee that consist of one dominant and one recessive allele.
- Homozygous Recessive Genotypes: Combinations such as dd or ff, featuring identical recessive alleles.
Expressing Phenotypes
- Genotypes Resulting in Dominant Phenotype: Include combinations such as Aa, Bb, BB, and AA, all resulting in the expression of the dominant trait.
- Genotypes Resulting in Recessive Phenotype: Only include combinations like dd and ff, where the recessive trait is expressed due to the absence of dominant alleles.
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