Question 1

In human males,genes on the X chromosome are

Accepted Answer

A) homozygous. 
B) heterozygous. 
C) homogametic. 
D) heterogametic. 
E) hemizygous. 
A) homozygous. 
B) heterozygous. 
C) homogametic. 
D) heterogametic. 
E) hemizygous.

Question 2

What is the connection between the work of Mary Lyon and Murray Barr?

Accepted Answer

Mary Lyon put forth the theory

Question 3

A person with an XO genotype for the sex chromosomes would be phenotypically

Accepted Answer

A) male. 
B) female. 
C) intersex (both male and female). 
D) male or female with equal probability. 
E) neither male nor female. 
A) male. 
B) female. 
C) intersex (both male and female). 
D) male or female with equal probability. 
E) neither male nor female.

Question 4

Half a woman's somatic cells express her paternal X chromosome and half express her maternal X chromosome.

Accepted Answer

A) True 
 B)False

Question 5

Chromosomes with only one arm are known as

Accepted Answer

A) metacentric. 
B) submetacentric. 
C) acrocentric. 
D) telocentric. 
E) acentric. 
A) metacentric. 
B) submetacentric. 
C) acrocentric. 
D) telocentric. 
E) acentric.

Question 6

How did chromosomes get their name?

Accepted Answer

The term,literally meaning "co

Question 7

Phenotypically,a female (XX)mouse embryo that was transformed with a small piece of a Y chromosome bearing the SRY gene would develop as

Accepted Answer

A) a male. 
B) a female. 
C) an intersex individual. 
D) a male initially,then revert to female after birth. 
E) a female initially,then revert to male after birth. 
A) a male. 
B) a female. 
C) an intersex individual. 
D) a male initially,then revert to female after birth. 
E) a female initially,then revert to male after birth.

Question 8

Barr bodies are inactivated X chromosomes.

Accepted Answer

A) True 
 B)False

Question 9

The chromosome theory of inheritance sought to explain Mendelian patterns in terms of chromosome movement.Can you think of an experimental approach to test for the Mendelian principle of segregation using chromosomes?

Accepted Answer

If replicating chromosomes could be chem

Question 10

The chromosome theory of inheritance states that

Accepted Answer

A) genes are located on chromosomes. 
B) chromosomes replicate before cell division. 
C) alleles of a gene segregate during cell division. 
D) chromosomes consist of DNA. 
E) different chromosomes assort independently of one another. 
A) genes are located on chromosomes. 
B) chromosomes replicate before cell division. 
C) alleles of a gene segregate during cell division. 
D) chromosomes consist of DNA. 
E) different chromosomes assort independently of one another.

Question 11

Closely related species,like chimpanzees and humans,often differ in chromosome number by only one or two chromosomes,suggesting that chromosomes can experience fission and fusion over evolutionary time.Can you think of a way to test this?

Accepted Answer

Generate a karyotype for the species of

Question 12

Synaptonemal complex forms during

Accepted Answer

A) leptonema. 
B) zygonema. 
C) pachynema. 
D) diplonema. 
E) diakinesis. 
A) leptonema. 
B) zygonema. 
C) pachynema. 
D) diplonema. 
E) diakinesis.

Question 13

Drosophila fruit flies,like mammals,have an X-Y sex-determination system.The insect differs from the mammalian system in an important respect,however.What is it?

Accepted Answer

While Drosophila has X-Y sex determinati

Question 14

Match between columns
                        Premises: 3N
XXY
2N+1
XO
XX

Accepted Answer

The Answer of Aneuploidy and Klinefelter syndrome and Polyploidy and is...

Question 15

In an organism with 16 chromosomes per cell,how many DNA molecules are present in a cell undergoing anaphase of mitosis?

Accepted Answer

A) 8 
B) 16 
C) 24 
D) 32 
E) 64 
A) 8 
B) 16 
C) 24 
D) 32 
E) 64

Question 16

Describe a situation in which two aneuploid gametes would yield a euploid zygote.

Accepted Answer

The aneuploidy of the gametes must be su

Question 17

A litter produced by a calico cat is not expected to include

Accepted Answer

A) solid-colored female kittens. 
B) calico female kittens. 
C) solid-colored male kittens. 
D) calico male kittens. 
E) Any of these 
A) solid-colored female kittens. 
B) calico female kittens. 
C) solid-colored male kittens. 
D) calico male kittens. 
E) Any of these

Question 18

Nondisjunction can lead to two forms of aneuploidy.What are they,and how do they occur?

Accepted Answer

The two most common aneuploid conditions

Question 19

X-linked or sex-linked traits are expressed in males but not in females.

Accepted Answer

A) True 
 B)False

Question 20

X-linked traits are more likely to be expressed in males.Why? Under what circumstances are they expressed in females?

Accepted Answer

Males are hemizygous,with only one X chr

Exam 12: Chromosomal Basis of Inheritance

In human males,genes on the X chromosome are

What is the connection between the work of Mary Lyon and Murray Barr?

A person with an XO genotype for the sex chromosomes would be phenotypically

Half a woman's somatic cells express her paternal X chromosome and half express her maternal X chromosome.

Chromosomes with only one arm are known as

How did chromosomes get their name?

Phenotypically,a female (XX)mouse embryo that was transformed with a small piece of a Y chromosome bearing the SRY gene would develop as

Barr bodies are inactivated X chromosomes.

The chromosome theory of inheritance sought to explain Mendelian patterns in terms of chromosome movement.Can you think of an experimental approach to test for the Mendelian principle of segregation using chromosomes?

The chromosome theory of inheritance states that

Closely related species,like chimpanzees and humans,often differ in chromosome number by only one or two chromosomes,suggesting that chromosomes can experience fission and fusion over evolutionary time.Can you think of a way to test this?

Synaptonemal complex forms during

Drosophila fruit flies,like mammals,have an X-Y sex-determination system.The insect differs from the mammalian system in an important respect,however.What is it?

In an organism with 16 chromosomes per cell,how many DNA molecules are present in a cell undergoing anaphase of mitosis?

Describe a situation in which two aneuploid gametes would yield a euploid zygote.

A litter produced by a calico cat is not expected to include

Nondisjunction can lead to two forms of aneuploidy.What are they,and how do they occur?

X-linked or sex-linked traits are expressed in males but not in females.

X-linked traits are more likely to be expressed in males.Why? Under what circumstances are they expressed in females?

Genetics: An Introduction

DNA: The Genetic Material

DNA Replication

Gene Function

Gene Expression: Transcription

Gene Expression: Translation

Dna Mutation, DNA Repair, and Transposable Elements

Genomics: The Mapping and Sequencing of Genomes

Functional and Comparative Genomics

Recombinant DNA Technology

Mendelian Genetics

Extensions of and Deviations From Mendelian Genetic Principles

Genetic Mapping in Eukaryotes

Genetics of Bacteria and Bacteriophages

Variations in Chromosome Structure and Number

Regulation of Gene Expression in Bacteria and Bacteriophages

Regulation of Gene Expression in Eukaryotes

Genetic Analysis of Development

Genetics of Cancer

Population Genetics

Quantitative Genetics

Molecular Evolution

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