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Chapter 20 The Principles of Inheritance

20.4 Post Quiz

20.4 Post Quiz

This activity contains 7 questions.

	How many pairs of autosomes are present in humans?   1 22 23 46

	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?   0% of males would be carriers and 100% of females would be carriers 0% of the offspring will have the disorder; 50% will be carriers 50% of the offspring will have the disorder; 50% will be carriers 50% of the males would have the disorder; 100% of the females would be carriers

	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?   this is a monosomy; most likely the mother had a nondisjunction this is a trisomy; most likely the sperm cell had a nondisjunction this is a trisomy; most likely the egg cell had a nondisjunction not enough information is given to determine a cause

	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?   recessive lethal alleles must cause sterility dominant alleles that cause lethal disorders are more serious than recessive lethal disorders carrying one dominant lethal allele causes death, carrying one recessive lethal allele does not none of the above

	If a disease is caused by a dominant allele, it means that a person with the disease:   will only pass it on to children if their mate also has the disease only needs to have one copy of the allele that causes the disease in order to have symptoms of the disease is more likely to be male will always pass it on to their children

	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:   dominant recessive sex-linked not enough information to tell

	A karyotype you are viewing shows an extra piece of chromosome #1 attached to chromosome #1. What type of abnormality caused this?   nondisjunction duplication inversion deletion

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