Podcast
Questions and Answers
What is the primary function of a gene?
What is the primary function of a gene?
- To contain the information to express a particular trait (correct)
- To transform a substrate into a product
- To modify the information of another allele
- To produce a dominant allele
What is the result of a modified allele producing a non-functional enzyme or no enzyme?
What is the result of a modified allele producing a non-functional enzyme or no enzyme?
- There is no effect on the phenotype
- The phenotype is dependent on the unmodified allele (correct)
- The phenotype is dependent on the modified allele
- The phenotype is a combination of both alleles
Why do some alleles become recessive?
Why do some alleles become recessive?
- Because they produce a more efficient enzyme
- Because they are not modified at all
- Because they are modified to produce a non-functional enzyme (correct)
- Because they are identical to the other allele
What is the relationship between the two alleles in a heterozygote?
What is the relationship between the two alleles in a heterozygote?
What is the role of the dominant allele?
What is the role of the dominant allele?
What happens when a modified allele is equivalent to the unmodified allele?
What happens when a modified allele is equivalent to the unmodified allele?
Why is the unmodified allele considered dominant?
Why is the unmodified allele considered dominant?
What is the result of a diploid organism having two copies of a gene?
What is the result of a diploid organism having two copies of a gene?
Study Notes
Understanding Dominance
- A gene contains the information to express a particular trait, and in a diploid organism, there are two copies of each gene, known as alleles.
- These two alleles may not always be identical, as in a heterozygote, where one allele may be different due to changes that modify the information it contains.
- An allele can be modified to produce a normal or less efficient enzyme, a non-functional enzyme, or no enzyme at all.
- If the modified allele produces a normal or less efficient enzyme, it is equivalent to the unmodified allele and produces the same phenotype.
- However, if the modified allele produces a non-functional enzyme or no enzyme, the phenotype may be affected, and the trait will only be dependent on the functioning of the unmodified allele.
Dominant and Recessive Alleles
- The unmodified allele, which represents the original phenotype, is the dominant allele.
- The modified allele, which produces a non-functional enzyme or no enzyme, is generally the recessive allele.
- The recessive trait is seen due to the non-functional enzyme or lack of enzyme production.
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Description
Learn about the concept of dominance, how alleles interact, and what determines their dominant or recessive behavior. Understand the role of genes in expressing traits and how heterozygotes affect genetic expression.
