Question 1

Describe chromosomal nondisjunction? What are the consequences of nondisjunction in meiosis?

Accepted Answer

Nondisjunction occurs when chromosomes f

Question 2

Different versions of genes are called

Accepted Answer

A)  homologues. 
B)  alleles. 
C)  autosomes. 
D)  sister chromatids. 
E)  centromeres. 
A)  homologues. 
B)  alleles. 
C)  autosomes. 
D)  sister chromatids. 
E)  centromeres.

Question 3

Autosomal trisomies

Accepted Answer

A)  usually do not cause any abnormalities. 
B)  cannot occur. 
C)  never lead to live births. 
D)  usually lead to miscarriages. 
E)  are usually due to chromosomal duplications. 
A)  usually do not cause any abnormalities. 
B)  cannot occur. 
C)  never lead to live births. 
D)  usually lead to miscarriages. 
E)  are usually due to chromosomal duplications.

Question 4

All of the following trisomies can still lead to live births EXCEPT

Accepted Answer

A)  Trisomy 1 
B)  Trisomy 13 
C)  Trisomy 18 
D)  Trisomy 21 
E)  Trisomy 8 
A)  Trisomy 1 
B)  Trisomy 13 
C)  Trisomy 18 
D)  Trisomy 21 
E)  Trisomy 8

Question 5

Nondisjunction events can lead to aneuploidy.

Accepted Answer

A) True 
 B)False

Question 6

A human cell that is polyploid might have _____ chromosomes.

Accepted Answer

A)  45 
B)  46 
C)  47 
D)  92 
E)  23 
A)  45 
B)  46 
C)  47 
D)  92 
E)  23

Question 7

Describe three major structural changes in chromosomes that can lead to genetic abnormalities?

Accepted Answer

Some of the common structural abnormalit

Question 8

MATCHING
Match the correct syndromes with the genetic abnormality.
-Patau syndrome

Accepted Answer

A) Trisomy 21 
B) XXY 
C) XO 
D) 47, +13 
E) Trisomy 18
F)47, XYY 
A) Trisomy 21 
B) XXY 
C) XO 
D) 47, +13 
E) Trisomy 18
F)47, XYY

Question 9

Which of the following chromosomes is the smallest in size?

Accepted Answer

A)  chromosome 22 
B)  chromosome 1 
C)  X chromosome 
D)  chromosome 12 
E)  chromosome 2 
A)  chromosome 22 
B)  chromosome 1 
C)  X chromosome 
D)  chromosome 12 
E)  chromosome 2

Question 10

Match the appropriate term with the description or term.
-Aneuploid

Accepted Answer

A) Zygote 
B) Involves gain or loss of a chromosome 
C) Sperm cell 
D) Extra copies of all the chromosomes 
A) Zygote 
B) Involves gain or loss of a chromosome 
C) Sperm cell 
D) Extra copies of all the chromosomes

Question 11

Sperm and oocytes are

Accepted Answer

A)  triploid. 
B)  aneuploid. 
C)  haploid. 
D)  diploid. 
E)  polyploid. 
A)  triploid. 
B)  aneuploid. 
C)  haploid. 
D)  diploid. 
E)  polyploid.

Question 12

What kinds of chromosomal defects invariably result in miscarriage in early pregnancy?

Accepted Answer

A)  all trisomies involving autosomes 
B)  all monosomies involving autosomes 
C)  all monosomies involving the sex chromosomes 
D)  all trisomies involving chromosome 21 
E)  all trisomies involving the sex chromosomes 
A)  all trisomies involving autosomes 
B)  all monosomies involving autosomes 
C)  all monosomies involving the sex chromosomes 
D)  all trisomies involving chromosome 21 
E)  all trisomies involving the sex chromosomes

Question 13

Amniocentesis

Accepted Answer

A)  involves removal of fluid and cells from around the fetus. 
B)  is usually used to determine if a female is pregnant. 
C)  is performed at or around the 12th week of pregnancy 
D)  involves a risk of about 1% for miscarriage 
E)  has a high risk for the mother's health. 
A)  involves removal of fluid and cells from around the fetus. 
B)  is usually used to determine if a female is pregnant. 
C)  is performed at or around the 12th week of pregnancy 
D)  involves a risk of about 1% for miscarriage 
E)  has a high risk for the mother's health.

Question 14

-The p arm.

Accepted Answer

The answer of  
-The p arm....

Question 15

MATCHING
Match the correct syndromes with the genetic abnormality.
-Klinefelter syndrome

Accepted Answer

A) Trisomy 21 
B) XXY 
C) XO 
D) 47, +13 
E) Trisomy 18
F)47, XYY 
A) Trisomy 21 
B) XXY 
C) XO 
D) 47, +13 
E) Trisomy 18
F)47, XYY

Question 16

What is considered the main risk factor for having a child with Down syndrome?

Accepted Answer

A)  maternal age 
B)  paternal age 
C)  exposure to radiation 
D)  exposure to cancer-causing chemicals 
E)  the combined age of the parents 
A)  maternal age 
B)  paternal age 
C)  exposure to radiation 
D)  exposure to cancer-causing chemicals 
E)  the combined age of the parents

Question 17

To produce an individual with Down syndrome (47,+21),

Accepted Answer

A)  a nondisjunction event must have occurred during spermatogenesis. 
B)  more than one sperm must have been involved in fertilization. 
C)  a nondisjunction event must have occurred during oogenesis. 
D)  this must have been caused by uniparental disomy. 
E)  a nondisjunction event could have occurred during spermatogenesis or oogenesis. 
A)  a nondisjunction event must have occurred during spermatogenesis. 
B)  more than one sperm must have been involved in fertilization. 
C)  a nondisjunction event must have occurred during oogenesis. 
D)  this must have been caused by uniparental disomy. 
E)  a nondisjunction event could have occurred during spermatogenesis or oogenesis.

Question 18

Structural changes in chromosomes never lead to genetic defects.

Accepted Answer

A) True 
 B)False

Question 19

Turner syndrome involves monosomy of the Y chromosome.

Accepted Answer

A) True 
 B)False

Question 20

Under what circumstances might a couple consult with a genetic counselor?

Accepted Answer

A)  If the woman will be over 35 years of age at the time of birth 
B)  Couples who are first cousins or other blood relatives 
C)  Couples who come from ethnic groups in which certain types of genetic defects are more common 
D)  Couples who have already had a child with a genetic disorder 
E)  All of these are possible reasons to consult with a genetic counselor. 
A)  If the woman will be over 35 years of age at the time of birth 
B)  Couples who are first cousins or other blood relatives 
C)  Couples who come from ethnic groups in which certain types of genetic defects are more common 
D)  Couples who have already had a child with a genetic disorder 
E)  All of these are possible reasons to consult with a genetic counselor.

Describe chromosomal nondisjunction? What are the consequences of nondisjunction in meiosis?

Different versions of genes are called

Autosomal trisomies

All of the following trisomies can still lead to live births EXCEPT

Nondisjunction events can lead to aneuploidy.

A human cell that is polyploid might have _____ chromosomes.

Describe three major structural changes in chromosomes that can lead to genetic abnormalities?

MATCHING Match the correct syndromes with the genetic abnormality. -Patau syndrome

Which of the following chromosomes is the smallest in size?

Match the appropriate term with the description or term. -Aneuploid

Sperm and oocytes are

What kinds of chromosomal defects invariably result in miscarriage in early pregnancy?

Amniocentesis

-The p arm.

MATCHING Match the correct syndromes with the genetic abnormality. -Klinefelter syndrome

What is considered the main risk factor for having a child with Down syndrome?

To produce an individual with Down syndrome (47,+21),

Structural changes in chromosomes never lead to genetic defects.

Turner syndrome involves monosomy of the Y chromosome.

Under what circumstances might a couple consult with a genetic counselor?

Sex and Development

Assisted Reproductive Technology

How Genes Are Transmitted From Generation to Generation

Gene Expression and Gene Regulation

Changes in DNA: Mutations and Epigenetics

Biotechnology

Genetic Testing and Prenatal Diagnosis

DNA Forensics

Genomics

Inheritance of Complex Traits

Cancer and the Cell Cycle

Behavior

Immunogenetics

Genetics and Populations

Human Evolution

A Different World: The Past, Present, and Future of Human Genetics

Biology Basics 1-Cells and Cell Structure

Biology Basics 2-DNA and RNA

Biology Basics 3-Genes, Populations, and the Environment

Filters

Exam 3: Changes in Chromosome Number

Describe chromosomal nondisjunction? What are the consequences of nondisjunction in meiosis?

Different versions of genes are called

Autosomal trisomies

All of the following trisomies can still lead to live births EXCEPT

Nondisjunction events can lead to aneuploidy.

A human cell that is polyploid might have _____ chromosomes.

Describe three major structural changes in chromosomes that can lead to genetic abnormalities?

MATCHING Match the correct syndromes with the genetic abnormality. -Patau syndrome

Which of the following chromosomes is the smallest in size?

Match the appropriate term with the description or term. -Aneuploid

Sperm and oocytes are

What kinds of chromosomal defects invariably result in miscarriage in early pregnancy?

Amniocentesis

-The p arm.

MATCHING Match the correct syndromes with the genetic abnormality. -Klinefelter syndrome

What is considered the main risk factor for having a child with Down syndrome?

To produce an individual with Down syndrome (47,+21),

Structural changes in chromosomes never lead to genetic defects.

Turner syndrome involves monosomy of the Y chromosome.

Under what circumstances might a couple consult with a genetic counselor?

Sex and Development

Assisted Reproductive Technology

How Genes Are Transmitted From Generation to Generation

Gene Expression and Gene Regulation

Changes in DNA: Mutations and Epigenetics

Biotechnology

Genetic Testing and Prenatal Diagnosis

DNA Forensics

Genomics

Inheritance of Complex Traits

Cancer and the Cell Cycle

Behavior

Immunogenetics

Genetics and Populations

Human Evolution

A Different World: The Past, Present, and Future of Human Genetics

Biology Basics 1-Cells and Cell Structure

Biology Basics 2-DNA and RNA

Biology Basics 3-Genes, Populations, and the Environment

Filters