Podcast
Questions and Answers
What is true about alleles in relation to dominance?
What is true about alleles in relation to dominance?
- All alleles contribute equally to the phenotype.
- Alleles have no impact on traits.
- Only recessive alleles can appear in the phenotype.
- One allele often dominates and obscures the presence of another. (correct)
In a typical F₂ generation, what proportion of offspring would be expected to show the dominant trait?
In a typical F₂ generation, what proportion of offspring would be expected to show the dominant trait?
- 1/2 will show the dominant trait.
- 1/4 will show the dominant trait.
- All offspring will show the dominant trait.
- 3/4 will show the dominant trait. (correct)
Which of the following statements about traits in the F₂ generation is accurate?
Which of the following statements about traits in the F₂ generation is accurate?
- The F₂ generation expresses traits derived from both parents of the P generation. (correct)
- The F₂ generation shows a uniform expression of all traits.
- The traits in the F₂ generation have no relation to the traits of the P generation.
- The traits in the F₂ generation come exclusively from only one parent.
How do dominant and recessive alleles interact in determining an organism's traits?
How do dominant and recessive alleles interact in determining an organism's traits?
What represents the concept of the 'Rule of Dominance'?
What represents the concept of the 'Rule of Dominance'?
Flashcards
Allele
Allele
One factor (gene) that controls a trait.
Dominant allele
Dominant allele
The stronger allele, which masks the effect of the recessive allele.
Recessive allele
Recessive allele
The weaker allele, which is hidden by the dominant allele.
F₁ Generation
F₁ Generation
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F₂ Generation
F₂ Generation
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Study Notes
Dominance in Traits
- Usually, one allele is dominant and hides the recessive allele
- Organisms have two factors (genes) that control traits
- Alleles are different forms of a gene
- Example: Tall vs. short, yellow vs. green
- 3/4 of F2 generation were tall
- 1/4 of F2 generation were short
- F2 generation has traits from both parents in the P generation
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