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Questions and Answers
Explain the difference between a monohybrid cross and a dihybrid cross.
Explain the difference between a monohybrid cross and a dihybrid cross.
A monohybrid cross is the inheritance of single characters and a dihybrid cross is the inheritance of 2 different characters.
Differentiate between incomplete dominance and codominance. Provide examples to support your answer.
Differentiate between incomplete dominance and codominance. Provide examples to support your answer.
Incomplete dominance is when the heterozygote shows an intermediate blended phenotype, whereas codominance is when 2 alleles affect the phenotype equally and separately.
In a Mendelian monohybrid cross of true breeding pea plants, which generation is always completely heterozygous?
In a Mendelian monohybrid cross of true breeding pea plants, which generation is always completely heterozygous?
What would be the resulting phenotypes of crossing two Tt plants? (T = tall plants, t = short plants)
What would be the resulting phenotypes of crossing two Tt plants? (T = tall plants, t = short plants)
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When purebred snapdragons with red flowers are crossed with purebred snapdragons with white flowers, all of the resulting offspring have pink flowers. Explain how this could be possible.
When purebred snapdragons with red flowers are crossed with purebred snapdragons with white flowers, all of the resulting offspring have pink flowers. Explain how this could be possible.
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Differentiate between polygenic traits and multiple-allele traits. Give an example for each type of inheritance.
Differentiate between polygenic traits and multiple-allele traits. Give an example for each type of inheritance.
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Study Notes
Genetic Crosses
- Monohybrid cross: Examines inheritance of a single trait.
- Dihybrid cross: Investigates inheritance of two different traits simultaneously.
Dominance Types
- Incomplete dominance: Heterozygote displays a blended phenotype (example: pink flowers from red and white parents).
- Codominance: Two alleles contribute equally and visibly to the phenotype (example: AB blood type).
Generational Genetics
- F1 generation in a Mendelian monohybrid cross is always completely heterozygous.
Phenotype Outcomes
- Crossing two Tt (tall, short) plants results in tall and short plants in the offspring.
Incomplete Dominance Example
- Crossing purebred red snapdragons with purebred white snapdragons produces pink flowers in the offspring due to color blending.
Trait Classifications
- Polygenic traits: Influenced by multiple genes (example: skin color).
- Multiple-allele traits: Governed by three or more alternative forms of a gene (example: ABO blood type).
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Description
Test your knowledge with these flashcards on key concepts from Biology Problem Set #9. This set focuses on genetics, covering topics such as monohybrid and dihybrid crosses, as well as incomplete dominance and codominance. Enhance your understanding of genetic inheritance patterns with these definitions and examples.
