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Questions and Answers
What defines a recessive gene?
What defines a recessive gene?
Which of the following scenarios describes a recessive gene at work?
Which of the following scenarios describes a recessive gene at work?
Which of the following statements is true regarding recessive genes?
Which of the following statements is true regarding recessive genes?
In which genetic scenario would a recessive allele be phenotypically expressed?
In which genetic scenario would a recessive allele be phenotypically expressed?
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How do recessive genes contribute to genetic variation?
How do recessive genes contribute to genetic variation?
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Study Notes
Recessive Gene Overview
- A recessive gene is an allele that does not manifest in the phenotype when a dominant allele is present.
- Recessive genes require two copies (homozygous) for the trait to be expressed phenotypically.
Scenarios of Recessive Genes
- Phenotypic expression of a recessive gene occurs only when an individual inherits two copies of the recessive allele from parents.
- An example scenario where a recessive gene is expressed includes individuals with traits like blue eyes or attached earlobes, only observed when both inherited alleles are recessive.
True Statements Regarding Recessive Genes
- A true statement about recessive genes is that they can be carried by individuals without expressing the associated traits, known as carriers (heterozygous individuals).
- Recessive alleles can skip generations, appearing in offspring if both parents are carriers.
Phenotypic Expression of Recessive Alleles
- For a recessive allele to be phenotypically expressed, the organism must be homozygous recessive (having two identical recessive alleles).
- Example: Cystic fibrosis results from a recessive allele, where an individual must inherit the allele from both parents for the condition to manifest.
Contribution to Genetic Variation
- Recessive genes contribute to genetic diversity by allowing variations in traits that may remain hidden in a population.
- When recessive alleles are expressed under certain environmental conditions or through specific breeding patterns, they enrich the genotypic pool.
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Description
Test your knowledge on the characteristics and behaviors of recessive genes. This quiz covers various scenarios that define recessive alleles, their phenotypic expressions, and their role in genetic variation. Determine your understanding of the fundamental principles of genetics.
