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Questions and Answers
What is a Punnett Square?
What is a Punnett Square?
- A chart that shows all the possible combinations of alleles that can result from a genetic cross (correct)
- A type of allele
- A method for cloning organisms
- A type of genetic disorder
What is a dominant allele?
What is a dominant allele?
An allele whose trait always shows up in the organism when the allele is present.
What is a recessive allele?
What is a recessive allele?
An allele that is hidden whenever the dominant allele is present.
What does homozygous dominant mean?
What does homozygous dominant mean?
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What does heterozygous mean?
What does heterozygous mean?
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What does homozygous recessive mean?
What does homozygous recessive mean?
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What is a phenotype?
What is a phenotype?
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What is a genotype?
What is a genotype?
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Study Notes
Punnett Squares
- A Punnett Square is a diagram used to predict the genetic combinations resulting from a cross between two organisms.
- It illustrates the possible allele combinations and their probabilities.
Dominant Alleles
- Dominant alleles are expressed in an organism's phenotype whenever present.
- Represented using uppercase letters (e.g., A).
Recessive Alleles
- Recessive alleles are masked by dominant alleles and do not manifest unless present in a homozygous state.
- Represented using lowercase letters (e.g., a).
Homozygous Dominant
- An organism with two identical dominant alleles for a trait (e.g., AA) is referred to as homozygous dominant.
- It guarantees the dominant phenotype will be expressed.
Heterozygous
- An organism with one dominant and one recessive allele (e.g., Tt) is heterozygous.
- Displays the dominant trait while carrying the recessive allele.
Homozygous Recessive
- An individual that has two identical recessive alleles for a trait (e.g., aa) is classified as homozygous recessive.
- Can only express the recessive phenotype.
Phenotype
- Refers to the observable characteristics or traits of an organism, resulting from the genotype.
- Examples include flower color, height, and seed shape.
Genotype
- The genotype is the specific combination of alleles (e.g., AA, Aa, aa) an organism possesses.
- Determines the potential phenotypic expressions of traits.
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