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Chapter Post-Test



 This activity contains 39 questions.

Question 1
1
Open Hint for Question 1 in a new window		 A trait like white eyes instead of red eyes in fruit flies or color blindness instead of normal vision in humans is more commonly seen in males than in females. When that type of inheritance pattern emerges, it is a good indication that the trait is caused by ______.
 
End of Question 1


Question 2
2
Open Hint for Question 2 in a new window		 Hemophilia is a sex-linked disorder. Which is the best prediction of the offspring if the mother is a carrier and the father has hemophilia?
 
End of Question 2


Question 3
3
Open Hint for Question 3 in a new window		 A female is born with color blindness. What is the most probable genotype of the parents?
 
End of Question 3


Question 4
4
Open Hint for Question 4 in a new window		 What is the result from change of the hemoglobin gene in sickle-cell anemia?
 
End of Question 4


Question 5
5
Open Hint for Question 5 in a new window		 A person who is a carrier for a genetic disease has which of the following phenotypes?
 
End of Question 5


Question 6
6
Open Hint for Question 6 in a new window		 How many pairs of autosomes are present in humans?
 
End of Question 6


Question 7
7
Open Hint for Question 7 in a new window		 Which of the following explanations could account for dominant alleles that cause lethal disorders being less common than recessive alleles that cause lethal disorders?
 
End of Question 7


Question 8
8
Open Hint for Question 8 in a new window		 If a disease is caused by a dominant allele, it means that a person with the disease ________.
 
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Question 9
9
Open Hint for Question 9 in a new window		 Much genetic information can be derived from pedigrees (family genetic histories). This is done primarily for humans because ____________.
 
End of Question 9


Question 10
10
Open Hint for Question 10 in a new window		 A plant biologist develops a seedless fruit. To be seedless, the fruit must be sterile. The sterility is the result of adding an entire set of chromosomes to the genome of the organism. What is this condition called?
 
End of Question 10


Question 11
11
Open Hint for Question 11 in a new window		 Alterations in a single trait, like white eyes versus red eyes in fruit flies or color blindness versus normal vision in humans, are the result of ______.
 
End of Question 11


Question 12
12
Open Hint for Question 12 in a new window		 Which of the following can result in aneuploidy?
 
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Question 13
13
Open Hint for Question 13 in a new window		 Which of the following can result in Down syndrome?
 
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Question 14
14
Open Hint for Question 14 in a new window		 What is nondisjunction?
 
End of Question 14


Question 15
15
Open Hint for Question 15 in a new window		 Karyotyping was done for a patient of suspected blood cancer. Chromosomal analysis indicated that there was an extra-long chromosome 9 and a shorter chromosome 22, called the Philadelphia chromosome. It is a diagnosis of chronic myeloid leukemia, a form of blood cancer in which a big portion of chromosome 22 is transferred to chromosome 9 and a small portion of 22 is transferred to chromosome 9. What is this form of chromosomal abnormality called?
 
End of Question 15


Question 16
16
Open Hint for Question 16 in a new window		 The b and c genes on a chromosome are linked. BBCC × bbcc is crossed to produce the F1 heterozygotes. Which of the following gametes can an F1 heterozygote produce?
 
End of Question 16


Question 17
17
Open Hint for Question 17 in a new window		 A fruit fly that is heterozygous for two genes (AaBb) is crossed with a homozygous recessive fruit fly (aabb). If the genes assorted independently, what proportion of the offspring would have the same phenotype as the parents?
 
End of Question 17


Question 18
18
Open Hint for Question 18 in a new window		 If a somatic cell from a diploid organism has 32 chromosomes, how many chromosomes would be in a gamete that is the result of nondisjunction involving a single pair of homologous chromosome?
 
End of Question 18


Question 19
19
Open Hint for Question 19 in a new window		 Nondisjunction during meiosis can occur at either the first or second meiotic division. Although neither event is desired, why would a nondisjunction during the second meiotic division be preferred over a nondisjunction in the first meiotic division?
 
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Question 20
20
Open Hint for Question 20 in a new window		 Amniocentesis is a technique __________.
 
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Question 21
21
Open Hint for Question 21 in a new window		 What is the application of preimplantation genetic diagnosis (PGD)?
 
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Question 22
22
Open Hint for Question 22 in a new window		 Which statement about Down syndrome is FALSE?
 
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Question 23
23
Open Hint for Question 23 in a new window		 Klinefelter syndrome (XXY) is an example of chromosomal aneuploidy that can be readily diagnosed by ________.
 
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Question 24
24
Open Hint for Question 24 in a new window		 An X-linked carrier is a ___________.
 
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Question 25
25
Open Hint for Question 25 in a new window		 Which of the following is a transfer of genetic material between nonhomologous chromosomes?
 
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Question 26
26
Open Hint for Question 26 in a new window		 Cri-du-chat syndrome is caused by ________.
 
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Question 27
27
Open Hint for Question 27 in a new window		 Which of the following genetic conditions is seen more often in males than in females?
 
End of Question 27


Question 28
28
Open Hint for Question 28 in a new window		 A female is not color-blind, but half her sons are color-blind. Her daughters are not color-blind. Which conclusion is correct?
 
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Question 29
29
Open Hint for Question 29 in a new window		 X-linked conditions are caused by ___________.
 
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Question 30
30
Open Hint for Question 30 in a new window		 A trait is seen with equal frequency in males and females. Two people who do not have the trait might have offspring who do have the trait, at a frequency of approximately 1 in 4. The inheritance of this trait is __________.
 
End of Question 30


Question 31
31
Open Hint for Question 31 in a new window		 Which disease is autosomal and results in misshapen RBCs that clog capillaries?
 
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Question 32
32
Open Hint for Question 32 in a new window		 What is one difference between polyploidy and aneuploidy?
 
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Question 33
33
Open Hint for Question 33 in a new window		 Nondisjunction involving the X chromosomes may occur during oogenesis and produce two kinds of eggs. If normal sperm fertilize the two types of eggs, which of the following pairs of genotypes are possible?
 
End of Question 33


Question 34
34
Open Hint for Question 34 in a new window		 Which of the following is correct regarding the sex chromosomes?
 
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Question 35
35
Open Hint for Question 35 in a new window		 The pedigrees of the European royal families show hemophilia was carried by Queen Victoria's daughters, which had important consequences in European history. What are the consequences of hemophilia?
 
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Question 36
36
Open Hint for Question 36 in a new window		 The main advantage of preimplantation genetic diagnosis (PGD) over amniocentesis is that _________________.
 
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Question 37
37
Open Hint for Question 37 in a new window		 Which condition or disease can be caused by aneuploidy?
 
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Question 38
38
Open Hint for Question 38 in a new window		 The probability that a man inherited his Y chromosome from his maternal grandfather is______.
 
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Question 39
39
Open Hint for Question 39 in a new window		 A woman whose husband worked as an X-ray technician gives birth to a hemophiliac son. Which of the following statements is true?
 
End of Question 39


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