Sex-Linked Inheritance Overview

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Questions and Answers

Which of the following traits is classified as Y-linked?

  • Facial hair growth
  • Webbed toes
  • Hypertrichosis pinnae auris (correct)
  • Ichthyosis hystrix

What is a characteristic of Y-linked inheritance?

  • Traits can skip generations
  • Only males are affected (correct)
  • Both sexes can be affected
  • It can affect females more than males

What condition is described as the thickening and darkening of the skin with bristle-like outgrowths?

  • Ichthyosis hystrix
  • Hypertrichosis pinnae auris
  • Webbed toes
  • Porcupine man (correct)

What defines a sex-limited trait?

<p>Its expression is limited to one biological sex (C)</p> Signup and view all the answers

What must be true for a recessive allele on the X chromosome to be expressed in females?

<p>It must be present on both X chromosomes. (A)</p> Signup and view all the answers

Which of the following is a sex-influenced trait?

<p>Beard growth (D)</p> Signup and view all the answers

Which of these conditions does NOT skip generations?

<p>Hypertrichosis pinnae auris (A)</p> Signup and view all the answers

Why are sex-linked disorders often more prevalent in males than females?

<p>Males have only one X chromosome. (A)</p> Signup and view all the answers

What characteristic is typical of sex-influenced traits?

<p>Their expression might differ between sexes (B)</p> Signup and view all the answers

Which trait is influenced by genetic factors present on autosomes but expressed differently based on sex?

<p>Baldness (C)</p> Signup and view all the answers

Which of the following traits is NOT an example of an X-linked recessive trait?

<p>Baldness (C)</p> Signup and view all the answers

What would render a pedigree to not be classified as X-linked recessive inheritance?

<p>An unaffected daughter has affected parents. (B)</p> Signup and view all the answers

What describes a characteristic of X-linked dominant inheritance?

<p>All daughters of affected mothers are affected. (C)</p> Signup and view all the answers

Which sex-linked trait is classified as recessive?

<p>Color blindness (D)</p> Signup and view all the answers

How can the probability of a child inheriting a sex-linked trait be calculated?

<p>By using a Punnet square to analyze parental combinations. (D)</p> Signup and view all the answers

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Study Notes

Sex-Linked Inheritance Overview

  • Sex-linked traits are determined by genes located on the sex chromosomes (X or Y).
  • X-linked traits have the gene on the X chromosome, while Y-linked traits have the gene on the Y chromosome.

X-Linked Recessive Traits

  • Disorders like hemophilia and color blindness are examples of X-linked recessive traits.
  • Females require two copies of the recessive allele (one on each X chromosome) to express the trait. Males, having one X, express the trait with just one recessive allele.

Hemophilia Example

  • In a cross between a woman with hemophilia (XhXh) and a normal man (XHY):
    • Punnett square can be used to calculate probabilities for offspring.
    • Sons have a probability of 100% being hemophiliac.
    • Daughters have a 0% probability of being hemophiliac.

Inheritance Patterns

  • X-linked dominant inheritance affects both sons and daughters if the mother is affected.
  • X-linked recessive inheritance often presents differently in pedigree analysis, where affected males directly influence the likelihood of affected sons.

Y-Linked Inheritance

  • Traits linked to the Y chromosome affect only males and do not skip generations.
  • Hypertrichosis pinnae auris is a Y-linked trait where affected males show hair growth from their external ears.

Other Y-Linked Traits

  • Conditions such as Porcupine man (skin condition) and webbed toes (connection between toes) are examples of Y-linked traits.

Sex-Influenced and Sex-Limited Traits

  • Sex-Influenced Traits: Traits controlled by genes on autosomes with expression influenced by the individual's sex, such as baldness.
  • Sex-Limited Traits: Traits expressed only in one biological sex, like breast development in females and beard growth in males.

Assignment Guidelines

  • Infographic/poster project about a sex-linked trait or disorder (excluding hemophilia).
  • Emphasis on content accuracy, organization, creativity, and mechanics with a total grading scale of 100%.

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