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In a genetic study, if a trait is controlled by a single gene with two alleles,

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Question: In a genetic study, if a trait is controlled by a single gene with two alleles, where one allele is completely dominant over the other, what type of inheritance pattern is this?

Options:

  1. Codominance
  2. Incomplete dominance
  3. Complete dominance
  4. Polygenic inheritance

Correct Answer: Complete dominance

Solution: 

This describes complete dominance, where one allele completely masks the effect of the other.

In a genetic study, if a trait is controlled by a single gene with two alleles,

Practice Questions

Q1
In a genetic study, if a trait is controlled by a single gene with two alleles, where one allele is completely dominant over the other, what type of inheritance pattern is this?
  1. Codominance
  2. Incomplete dominance
  3. Complete dominance
  4. Polygenic inheritance

Questions & Step-by-Step Solutions

In a genetic study, if a trait is controlled by a single gene with two alleles, where one allele is completely dominant over the other, what type of inheritance pattern is this?
  • Step 1: Understand that a trait is a characteristic that can be passed from parents to offspring.
  • Step 2: Know that genes are segments of DNA that determine traits.
  • Step 3: Recognize that alleles are different versions of a gene.
  • Step 4: Identify that in this case, there are two alleles for the trait.
  • Step 5: Learn that one allele is dominant, meaning it can mask the effect of the other allele.
  • Step 6: Conclude that when one allele completely masks the other, this is called complete dominance.
  • Complete Dominance – A genetic inheritance pattern where one allele completely masks the effect of another allele.
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