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CMU Genetics Week 2: Chapter 3 & 4 Practice Questions and Answers

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CMU Genetics Week 2: Chapter 3 & 4 Practice Questions and Answers What is the distinctive pattern of inheritance found for X-linked recessive traits? a. Affects only males. b. Affected males have an affected father. c. Hemizygous males and homozygous females are affected. d. Mutant characters...

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  • October 23, 2024
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CMU Genetics Week 2: Chapter 3 & 4
Practice Questions and Answers

What is the distinctive pattern of inheritance found for X-linked recessive traits?




a. Affects only males.


b. Affected males have an affected father.


c. Hemizygous males and homozygous females are affected.


d. Mutant characters are combined.


e. Affected individuals will always have an affected parent and an unaffected parent. - Ans:✔✔-c.

Hemizygous males and homozygous females are affected.


Which of the following statements is true about sex-linked traits?




a. X-linked recessive genes are never expressed in males.



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b. In general, males are affected by X-linked recessive disorders far more frequently than females.


c.Fathers do not donate their Y chromosome to their sons.


d. All of these statements are true. - Ans:✔✔-b. In general, males are affected by X-linked recessive

disorders far more frequently than females.


Congenital generalized hypertrichosis (CGH) is an X-linked dominant condition that produces dense hair

on the face and upper body. What is the chance that a male affected by this condition will pass it on to

his daughters (assume the mother is unaffected)?




a. 0%


b. 25%


c. 50%


d. 100%


e. 75% - Ans:✔✔-D: 100%


Which of the following trisomies is the least likely to lead to a live births?




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Trisomy 21.




Trisomy 13.




Trisomy 18.




Trisomy 1.




All of these trisomies can lead to live births. - Ans:✔✔-Trisomy 1


Different versions of genes are called_____.




Homologues




Alleles




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Autosomes




Sister Chromatids




Centromeres - Ans:✔✔-alleles


Jacobs syndrome involves




an extra Y chromosome (XYY)




an extra X chromosome (XXX)




a deletion of Y the chromosome




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