Question 1

A person who has an extra copy of a chromosome is said to have

Accepted Answer

A)  monosomy. 
B)  bisomy. 
C)  trisomy. 
D)  nondisjunction. 
E)  duplication. 
A)  monosomy. 
B)  bisomy. 
C)  trisomy. 
D)  nondisjunction. 
E)  duplication.

Question 2

Karyotyping can be used to diagnose which of the following genetic disorders?

Accepted Answer

A)  Down syndrome 
B)  phenylketonuria 
C)  neurofibromatosis 
D)  cystic fibrosis 
E)  hemophilia 
A)  Down syndrome 
B)  phenylketonuria 
C)  neurofibromatosis 
D)  cystic fibrosis 
E)  hemophilia

Question 3

List the four X-linked recessive disorders.

Accepted Answer

1.Color blindness
2.

Question 4

A female with two Barr bodies in her cells would have what combination of sex chromosomes?

Accepted Answer

A)  XXY 
B)  XXXY 
C)  XXX 
D)  XX 
E)  XYY 
A)  XXY 
B)  XXXY 
C)  XXX 
D)  XX 
E)  XYY

Question 5

Describe a genetic disorder associated with a deletion in chromosomal number.

Accepted Answer

Williams syndrome occurs when chromosome

Question 6

Which refers to the addition of a repeat segment of a chromosome?

Accepted Answer

A)  inversion 
B)  translocation 
C)  deletion 
D)  duplication 
E)  monosomy 
A)  inversion 
B)  translocation 
C)  deletion 
D)  duplication 
E)  monosomy

Question 7

All of the genes on a single chromosome are

Accepted Answer

A)  A locus 
B)  Homologous 
C)  A linkage map 
D)  A linkage group 
E)  An allele 
A)  A locus 
B)  Homologous 
C)  A linkage map 
D)  A linkage group 
E)  An allele

Question 8

Genes on the ___ chromosome determine if the sex of a child will be male or female.

Accepted Answer

A)  X 
B)  Y 
C)  21st 
D)  5th 
E)  19th 
A)  X 
B)  Y 
C)  21st 
D)  5th 
E)  19th

Question 9

Which of the following is NOT true about a karyotype?

Accepted Answer

A)  Homologous chromosomes are arranged in pairs. 
B)  Sex chromosomes are identified separately from autosomes. 
C)  All chromosome pairs are numbered differently for males and females. 
D)  Chromosome pairs are assorted by both size and shape. 
E)  Banding patterns are used in pairing chromosomes. 
A)  Homologous chromosomes are arranged in pairs. 
B)  Sex chromosomes are identified separately from autosomes. 
C)  All chromosome pairs are numbered differently for males and females. 
D)  Chromosome pairs are assorted by both size and shape. 
E)  Banding patterns are used in pairing chromosomes.

Question 10

Among the disorders caused by changes in chromosome structure are all but one of those listed below; that one is

Accepted Answer

A)  Fragile X syndrome 
B)  Klinefelter syndrome 
C)  Williams syndrome 
D)  Cri du chat syndrome 
E)  All of these are caused by a change in chromosome structure 
A)  Fragile X syndrome 
B)  Klinefelter syndrome 
C)  Williams syndrome 
D)  Cri du chat syndrome 
E)  All of these are caused by a change in chromosome structure

Question 11

If a woman is a carrier for the color blind recessive allele and her husband is normal,what are their chances that a son will be color blind?

Accepted Answer

A)  None since the father is normal. 
B)  50%, since the mother is only a carrier. 
C)  100% because the mother has the gene. 
D)  25% because the mother is a hybrid. 
E)  None since the son will also be just a carrier. 
A)  None since the father is normal. 
B)  50%, since the mother is only a carrier. 
C)  100% because the mother has the gene. 
D)  25% because the mother is a hybrid. 
E)  None since the son will also be just a carrier.

Question 12

Considering that males can have Klinefelter (XXY)syndrome,XYY,and normal XY chromosomal combinations,and females can have Turner (XO)syndrome,poly-X (XXX,XXXX),and normal XX combinations,it is obvious that

Accepted Answer

A)  maleness results from the presence of only one X chromosome. 
B)  maleness results from the absence of two or more X chromosomes. 
C)  maleness results from the minimal presence of one Y chromosome. 
D)  femaleness results from the presence of two or more X chromosomes. 
E)  sex determination is a delicate balance between X and Y chromosomes. 
A)  maleness results from the presence of only one X chromosome. 
B)  maleness results from the absence of two or more X chromosomes. 
C)  maleness results from the minimal presence of one Y chromosome. 
D)  femaleness results from the presence of two or more X chromosomes. 
E)  sex determination is a delicate balance between X and Y chromosomes.

Question 13

A colorblind (recessive trait)woman will pass the allele to

Accepted Answer

A)  her sons only. 
B)  all her children. 
C)  her daughters only. 
D)  none of her children. 
E)  her husband. 
A)  her sons only. 
B)  all her children. 
C)  her daughters only. 
D)  none of her children. 
E)  her husband.

Question 14

An individual who has an XXY combination of sex chromosomes is said to have _____ syndrome.

Accepted Answer

A)  Klinefelter 
B)  Turner 
C)  Down 
D)  fragile X 
E)  cri du chat 
A)  Klinefelter 
B)  Turner 
C)  Down 
D)  fragile X 
E)  cri du chat

Question 15

If a person inherits two X chromosomes,this individual will be

Accepted Answer

A)  female. 
B)  male. 
C)  colorblind. 
D)  sterile. 
E)  a poly-X female. 
A)  female. 
B)  male. 
C)  colorblind. 
D)  sterile. 
E)  a poly-X female.

Question 16

An XXX female would most likely result from nondisjunction in

Accepted Answer

A)  the mother during egg formation. 
B)  the father during sperm formation 
C)  in both the mother and father during gamete formation. 
D)  the fertilized egg. 
E)  neither the mother nor the father. 
A)  the mother during egg formation. 
B)  the father during sperm formation 
C)  in both the mother and father during gamete formation. 
D)  the fertilized egg. 
E)  neither the mother nor the father.

Question 17

A karyotype will NOT reveal which of the following genetic diseases?

Accepted Answer

A)  Turner syndrome 
B)  Klinefelter syndrome 
C)  Down syndrome 
D)  cri du chat syndrome 
E)  hemophilia 
A)  Turner syndrome 
B)  Klinefelter syndrome 
C)  Down syndrome 
D)  cri du chat syndrome 
E)  hemophilia

Question 18

Which genetic trait is NOT associated with the chromosome involved in Down syndrome?

Accepted Answer

A)  increased incidence of leukemia 
B)  cataracts 
C)  mental retardation 
D)  accelerated aging 
E)  cystic fibrosis 
A)  increased incidence of leukemia 
B)  cataracts 
C)  mental retardation 
D)  accelerated aging 
E)  cystic fibrosis

Exam 24: Chromosomal Basis of Inheritance

A person who has an extra copy of a chromosome is said to have

Karyotyping can be used to diagnose which of the following genetic disorders?

List the four X-linked recessive disorders.

A female with two Barr bodies in her cells would have what combination of sex chromosomes?

Describe a genetic disorder associated with a deletion in chromosomal number.

Which refers to the addition of a repeat segment of a chromosome?

All of the genes on a single chromosome are

Genes on the ___ chromosome determine if the sex of a child will be male or female.

Which of the following is NOT true about a karyotype?

Among the disorders caused by changes in chromosome structure are all but one of those listed below; that one is

If a woman is a carrier for the color blind recessive allele and her husband is normal,what are their chances that a son will be color blind?

Considering that males can have Klinefelter (XXY)syndrome,XYY,and normal XY chromosomal combinations,and females can have Turner (XO)syndrome,poly-X (XXX,XXXX),and normal XX combinations,it is obvious that

A colorblind (recessive trait)woman will pass the allele to

An individual who has an XXY combination of sex chromosomes is said to have _____ syndrome.

If a person inherits two X chromosomes,this individual will be

An XXX female would most likely result from nondisjunction in

A karyotype will NOT reveal which of the following genetic diseases?

Which genetic trait is NOT associated with the chromosome involved in Down syndrome?

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