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Questions and Answers
Which of the following is a characteristic of sex-linked inheritance?
Which of the following is a characteristic of sex-linked inheritance?
- It is characterized by X-linked recessive and dominant conditions (correct)
- It affects males and females equally
- It occurs when a gene mutation is present on a non-sex chromosome
- It is only observed in humans
Which statement about X-linked conditions is true?
Which statement about X-linked conditions is true?
- X-linked conditions affect males and females equally
- Females are always affected by X-linked conditions
- Both males and females can be carriers for X-linked conditions (correct)
- Males are more commonly carriers for X-linked conditions
Why are there more X-linked conditions than Y-linked conditions in humans?
Why are there more X-linked conditions than Y-linked conditions in humans?
- Y-linked conditions are more lethal and result in fewer offspring
- Humans have more genes on the X chromosome than the Y chromosome (correct)
- Y-linked conditions are more common in females
- X-linked conditions are more common in males
In X-linked recessive inheritance, which individuals are more commonly affected?
In X-linked recessive inheritance, which individuals are more commonly affected?
What is the role of the second X chromosome in males?
What is the role of the second X chromosome in males?
Flashcards
Sex-linked inheritance
Sex-linked inheritance
A mode of inheritance where genes are located on sex chromosomes.
X-linked Condition
X-linked Condition
A condition where a gene on the X chromosome is affected, causing different expression in males and females.
X-linked recessive inheritance
X-linked recessive inheritance
Males are more likely to inherit and express X-linked recessive conditions because they have only one X chromosome.
Carriers for X-linked conditions
Carriers for X-linked conditions
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Role of the second X chromosome in males
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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