Sex Linkage and Traits

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Questions and Answers

What distinguishes X-Y linked traits from other sex-linked traits?

They are influenced by environmental factors rather than genetics.
They exhibit a pattern of inheritance similar to autosomal traits. (correct)
They are controlled by alleles found on both the X and Y chromosomes.
They are inherited exclusively through the paternal lineage.

Which of the following statements about Y-linked traits is correct?

They are only passed down from fathers to sons. (correct)
Y-linked traits are more common than X-linked traits.
They are primarily responsible for determining an individual's sex.
They exhibit a higher rate of mutation compared to other sex-linked traits.

Which of the following is a characteristic of X-linked traits?

They are exclusively inherited from the mother.
They display a pattern of inheritance that is independent of gender.
They are primarily responsible for determining an individual's sex.
They are more likely to be expressed in males than in females. (correct)

Which of the following best describes the concept of pseudoautosomal traits?

<p>Traits that are controlled by alleles located on both the X and Y chromosomes and exhibit a pattern of inheritance similar to autosomal traits. (D)</p> Signup and view all the answers

Why are Y-linked traits less common than X-linked traits?

<p>The Y chromosome is much smaller than the X chromosome and carries fewer genes. (A)</p> Signup and view all the answers

Flashcards

Sex Linkage

Traits controlled by alleles on sex chromosomes.

X-linked Traits

Traits controlled by alleles only on the X chromosome.

Y-linked Traits

Traits controlled by alleles only on the Y chromosome.

Pseudo Autosomal Traits

Traits with alleles on both X and Y chromosomes.

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Inheritance of Pseudo Autosomal Traits

Inherit like autosomal traits despite being on sex chromosomes.

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Study Notes

Sex Linkage

Sex linkage describes traits controlled by alleles on sex chromosomes (X and Y).
X-linked traits are controlled by alleles solely on the X chromosome.
Y-linked traits are controlled by alleles solely on the Y chromosome.
X-Y linked (or pseudoautosomal) traits have genes on both X and Y chromosomes.
Unlike other sex-linked traits, pseudoautosomal traits inherit like autosomal traits (non-sex chromosomes).
Y-linked traits are rare due to few Y-chromosome alleles.