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Home  arrow Chapter 4  arrow Post-quiz: 4.2 X-linked Inheritance

Post-quiz: 4.2 X-linked Inheritance

For the information necessary in completing this quiz, refer to Web Tutorial 4.2 X-linked Inheritance and Section 4.10 X-Linkage Describes Genes on the X Chromosome in your textbook.

This activity contains 6 questions.

Question 1.
A gene that is not on a sex chromosome is termed __.

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Question 2.
In dealing with an X-linked trait, a male will express X chromosome alleles directly in the phenotype because the Y chromosome lacks homology with the X-linked gene. This condition is referred to as being __.

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Question 3.
A female is heterozygous for the recessive X-linked gene for Lesch-Nyhan syndrome, a recessive gene that leads to mental retardation, self mutilation, and early death. What proportion of her daughters will be "carriers" for the trait?

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Question 4.
A female is diagnosed with hemophilia, an X-linked recessive gene disorder characterized by failure of blood to clot. In checking her medical history, the doctor will most likely discover that ___.

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Question 5.
For a male to have X-linked hemophilia, ___.

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Question 6.
If an X-linked disorder is normally lethal before the onset of reproduction, which of the following is true?

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