Podcast
Questions and Answers
What does Mendel's Law of Segregation state about gametes?
What does Mendel's Law of Segregation state about gametes?
In a dihybrid cross between HhSs and hhss, what will be the genotype of one of the gametes from the first parent?
In a dihybrid cross between HhSs and hhss, what will be the genotype of one of the gametes from the first parent?
What phenotype will result from a cross of alleles exhibiting codominance?
What phenotype will result from a cross of alleles exhibiting codominance?
Which of the following examples illustrates incomplete dominance?
Which of the following examples illustrates incomplete dominance?
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In a monohybrid cross, what is the probability of obtaining a recessive phenotype?
In a monohybrid cross, what is the probability of obtaining a recessive phenotype?
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Study Notes
Dihybrid Crossing
- A dihybrid cross is a cross between two pairs of alleles
- "di" means "two"
- Dominant allele (denoted by capital letter, e.g., H) produces a dominant phenotype in individuals who have at least one copy of the allele (Hh or HH)
- Recessive allele (denoted by lowercase letter, e.g., h) produces a recessive phenotype only when both alleles are recessive (hh)
Monohybrid Cross
- A cross between 2 organisms creating different variations
- Only a 25% chance of getting a specific characteristic (like blue eyes)
Gametes
- Gametes (sperm/egg cells) only carry one allele for a gene
- When more than one gene is present, all combinations must be included in the cross
Mendel's Law of Independent Assortment
- Alleles are not linked
- Independent segregation of alleles during gamete formation
Dihybrid Cross Example
- Example of a dihybrid cross: HhSs x hhss
- Use the FOIL method (First, Outside, Inside, Last) to determine the possible gametes
Codominance
- Both alleles are expressed equally
- Neither allele is dominant
- Both alleles contribute to the phenotype, like spots, AB blood type, or flower petal color
Incomplete Dominance
- When both alleles are partially expressed, a "mixed" phenotype (e.g., mesh) is created
- Examples include skin color and flower color
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Description
This quiz covers the concepts of dihybrid and monohybrid crosses in genetics. It explores the principles of allele dominance, independent assortment, and gamete formation. Test your understanding with examples and key terms related to these foundational genetics topics.
