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Home  arrow Chapter 20 The Principles of Inheritance  arrow 20.4 Post Quiz

20.4 Post Quiz



This activity contains 7 questions.

Question 1.
How many pairs of autosomes are present in humans?


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Question 2.
Phenylketonuria is caused by an autosomal recessive allele. A man is the carrier of the disorder; his wife does not have PKU and is not a carrier. What is the probability their offspring will have the disorder and others will be carriers?


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Question 3.
A karyotype reveals that a woman is carrying a fetus that has 47 chromosomes. The test reveals that the genotype of the fetus is XYY. Which of the following statements would be correct?


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Question 4.
Which of the following explanations could account for the fact that dominant alleles that cause lethal disorders are less common than recessive alleles that cause lethal disorders?


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Question 5.
If a disease is caused by a dominant allele, it means that a person with the disease:


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Question 6.
A person with an inherited disorder has a child with a person who does not have the disorder. Half the children have the disorder, both males and females. The pattern of inheritance is:


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Question 7.
A karyotype you are viewing shows an extra piece of chromosome #1 attached to chromosome #1. What type of abnormality caused this?


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