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Questions and Answers
Which of the following is a characteristic of sex-linked inheritance?
Which statement about X-linked conditions is true?
Why are there more X-linked conditions than Y-linked conditions in humans?
In X-linked recessive inheritance, which individuals are more commonly affected?
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What is the role of the second X chromosome in males?
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Study Notes
Sex-Linked Inheritance
- A characteristic of sex-linked inheritance is that the genes are located on the sex chromosomes (X or Y).
- X-linked conditions are more common than Y-linked conditions in humans because the X chromosome has more genes than the Y chromosome.
X-Linked Recessive Inheritance
- In X-linked recessive inheritance, males are more commonly affected because they only have one X chromosome, so a single mutated gene is enough to express the condition.
- Females, on the other hand, are carriers of the condition but are less likely to be affected because they have a second X chromosome that can provide a functional copy of the gene.
Role of the Second X Chromosome
- In females, the second X chromosome plays a crucial role in X-linked recessive inheritance by providing a functional copy of the gene, which can compensate for the mutated gene on the other X chromosome.
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Description
Test your knowledge of sex-linked inheritance and presentation with this quiz. Learn about X-linked recessive, X-linked dominant, and Y-linked traits and how they differ depending on the sex of the parent and child.
