Multiple Choice
In humans, which parent determines the gender of the offspring through sex-linked inheritance?
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13. Mendelian Genetics
Sex-Linked Inheritance
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In sex-linked inheritance, what can we say about the frequency of X-linked recessive traits in males compared to females?
A
X-linked recessive traits are more common in females because they have two X chromosomes.
B
X-linked recessive traits are less common in males because they have a Y chromosome.
C
X-linked recessive traits are equally common in males and females because both have X chromosomes.
D
X-linked recessive traits are more common in males because they have only one X chromosome.
Verified step by step guidance1
Understand the concept of sex-linked inheritance: Sex-linked traits are associated with genes located on sex chromosomes, primarily the X chromosome.
Recognize the difference in chromosome composition between males and females: Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
Consider the inheritance pattern of X-linked recessive traits: For a recessive trait to be expressed, females need two copies of the recessive allele (one on each X chromosome), whereas males need only one copy (since they have only one X chromosome).
Analyze the probability of expressing X-linked recessive traits: Since males have only one X chromosome, any recessive allele present will be expressed, making X-linked recessive traits more common in males.
Conclude that X-linked recessive traits are more common in males because they have only one X chromosome, which means a single recessive allele will result in the trait being expressed.
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