Question 1

At which stage of meiosis does crossing-over occur?

Accepted Answer

A)  Prophase of the first meiotic division 
B)  Anaphase of the first meiotic division 
C)  Prophase of the second meiotic division 
D)  Anaphase of the second meiotic division 
A)  Prophase of the first meiotic division 
B)  Anaphase of the first meiotic division 
C)  Prophase of the second meiotic division 
D)  Anaphase of the second meiotic division A

Question 2

Sections of DNA that do not code for a final product,and which may intervene in a DNA sequence are

Accepted Answer

A)  transcribed into RNA. 
B)  exons. 
C)  introns. 
D)  interferons. 
A)  transcribed into RNA. 
B)  exons. 
C)  introns. 
D)  interferons. C

Question 3

The most familiar form of aneuploidy in humans results in Down Syndrome or ________ _________.

Accepted Answer

trisomy 21

Question 4

Males are said to be ________ for traits carried on the X chromosome

Accepted Answer

A)  codominant 
B)  polygenic 
C)  hemizygous 
D)  homozygous 
A)  codominant 
B)  polygenic 
C)  hemizygous 
D)  homozygous

Question 5

Which of the following is NOT correct about X-linked characteristics?

Accepted Answer

A)  More males than females are affected. 
B)  If a female exhibits the trait, all of her sons will also inherit and exhibit it. 
C)  Females can be carriers of the gene without showing it. 
D)  Males have two copies of the alleles for the trait, but females have only one. 
A)  More males than females are affected. 
B)  If a female exhibits the trait, all of her sons will also inherit and exhibit it. 
C)  Females can be carriers of the gene without showing it. 
D)  Males have two copies of the alleles for the trait, but females have only one.

Question 6

You expect to find a ratio of 9:3:3:1 among the F2 offspring in which type of cross?

Accepted Answer

A)  Monohybrid cross 
B)  Dihybrid cross 
C)  Test cross 
D)  Sex-linked cross 
A)  Monohybrid cross 
B)  Dihybrid cross 
C)  Test cross 
D)  Sex-linked cross

Question 7

Which of the following processes synthesizes mRNA,tRNA,or rRNA?

Accepted Answer

A)  Translation 
B)  Transcription 
C)  Transposition 
D)  None of the choices are correct 
A)  Translation 
B)  Transcription 
C)  Transposition 
D)  None of the choices are correct

Question 8

Which of the following statements about DNA replication is NOT correct?

Accepted Answer

A)  Replication occurs as each base is paired with another exactly like it. 
B)  Unwinding of the DNA molecule occurs as hydrogen bonds break. 
C)  DNA polymerase catalyzes DNA replication. 
D)  Complementary base pairs are held together with hydrogen bonds. 
A)  Replication occurs as each base is paired with another exactly like it. 
B)  Unwinding of the DNA molecule occurs as hydrogen bonds break. 
C)  DNA polymerase catalyzes DNA replication. 
D)  Complementary base pairs are held together with hydrogen bonds.

Question 9

F2 offspring of a monohybrid cross involving Aa genotype show which genotype(s)?

Accepted Answer

A)  Aa only 
B)  AA and Aa 
C)  Aa and aa 
D)  AA, Aa, and aa 
A)  Aa only 
B)  AA and Aa 
C)  Aa and aa 
D)  AA, Aa, and aa

Question 10

Beadle and Tatum's mutated Neurospora were unable to grow on minimal media plus metabolites A or B,but did grow on minimal media plus metabolites C and D,indicating enzyme 2 was missing from the hypothetical pathway.

Accepted Answer

A)  If only enzyme 1 was missing,then growth would occur with just metabolite B. 
B)  From the limited data given here,enzyme 1 could also be missing from the original experiment. 
C)  Any minimal media with metabolite D should grow the Neurospora without revealing if the strain contains or lacks enzymes 1,2 or 3. 
D)  Failure to grow on minimal media possessing metabolites A,B and C reflects a lack of enzyme 3. 
E)  All of the choices are correct. 
A)  If only enzyme 1 was missing,then growth would occur with just metabolite B. 
B)  From the limited data given here,enzyme 1 could also be missing from the original experiment. 
C)  Any minimal media with metabolite D should grow the Neurospora without revealing if the strain contains or lacks enzymes 1,2 or 3. 
D)  Failure to grow on minimal media possessing metabolites A,B and C reflects a lack of enzyme 3. 
E)  All of the choices are correct.

Question 11

In Mendel's pea plants,round seeds (R)were dominant,and wrinkled seeds (r)were recessive.The endosperm of the pea is also either starchy,a dominant gene (S),or waxy,the recessive allele (s).If these genes are not linked,which of the following is true of a heterozygous dihybrid cross?

Accepted Answer

A)  It is impossible to obtain offspring that are homozygous for both dominant genes. 
B)  It is impossible to obtain offspring that are homozygous for both recessive genes. 
C)  It is impossible to obtain offspring that are homozygous for one dominant gene such as round seed and homozygous recessive for the other recessive waxy gene. 
D)  It is possible to produce offspring that are homozygous dominant for both traits, homozygous dominant for one trait but not the other, and homozygous recessive for both traits. 
A)  It is impossible to obtain offspring that are homozygous for both dominant genes. 
B)  It is impossible to obtain offspring that are homozygous for both recessive genes. 
C)  It is impossible to obtain offspring that are homozygous for one dominant gene such as round seed and homozygous recessive for the other recessive waxy gene. 
D)  It is possible to produce offspring that are homozygous dominant for both traits, homozygous dominant for one trait but not the other, and homozygous recessive for both traits.

Question 12

Which RNA molecules carry genetic information away from DNA when it is needed for the construction of a protein?

Accepted Answer

A)  Ribosomal RNA 
B)  Transfer RNA 
C)  Messenger RNA 
D)  Primary mrna transcript 
A)  Ribosomal RNA 
B)  Transfer RNA 
C)  Messenger RNA 
D)  Primary mrna transcript

Question 13

A codon is composed of _______ bases.

Accepted Answer

A)  two 
B)  three 
C)  four 
D)  six 
A)  two 
B)  three 
C)  four 
D)  six

Question 14

Which is a correct usage of phenotype and genotype?

Accepted Answer

A)  Phenotype is the cause of genotype 
B)  Phenotype is restricted to characteristics involving size and color 
C)  One genotype may produce many phenotypes 
D)  Two different genotypes may produce the same phenotype 
A)  Phenotype is the cause of genotype 
B)  Phenotype is restricted to characteristics involving size and color 
C)  One genotype may produce many phenotypes 
D)  Two different genotypes may produce the same phenotype

Question 15

If an egg of a worm contains 6 chromosomes,it comes from a worm that has ______ chromosomes in each body cell.

Accepted Answer

A)  3 
B)  6 
C)  12 
D)  24 
A)  3 
B)  6 
C)  12 
D)  24

Question 16

_________ _________ are enzymes derived from bacteria; they cleave double-stranded DNA at a particular site determined by the particular base sequences (recognition site)at that point.

Accepted Answer

Restrictio

Question 17

What was the relationship between Gregor Mendel's work and the growing understanding of cells and chromosomes?

Accepted Answer

A)  Mendel's work immediately generated great interest in what was the genetic material 
B)  Mendel was unaware of chromosomes and genes, which were not identified for 30 years 
C)  Breakthroughs in cytology and the structure of chromosomes were the factor that led Mendel to his experiments 
D)  Mendel's work led cell biologists to discover the nucleus and its role 
A)  Mendel's work immediately generated great interest in what was the genetic material 
B)  Mendel was unaware of chromosomes and genes, which were not identified for 30 years 
C)  Breakthroughs in cytology and the structure of chromosomes were the factor that led Mendel to his experiments 
D)  Mendel's work led cell biologists to discover the nucleus and its role

Question 18

Joined sister chromatids of each pair of homologous chromosomes come into side-by-side contact or ____ to form a tetrad.

Accepted Answer

A)  crossing-over 
B)  locus 
C)  dyad 
D)  synapse 
A)  crossing-over 
B)  locus 
C)  dyad 
D)  synapse

Question 19

The polymerase chain reaction is

Accepted Answer

A)  part of the normal process of DNA replication in the cell. 
B)  a way to amplify small samples of DNA when a short sequence is known. 
C)  a method for constructing complementary DNA by transcribing the base sequence with reverse transcriptase. 
D)  None of the choices are correct. 
A)  part of the normal process of DNA replication in the cell. 
B)  a way to amplify small samples of DNA when a short sequence is known. 
C)  a method for constructing complementary DNA by transcribing the base sequence with reverse transcriptase. 
D)  None of the choices are correct.

Question 20

What is the function of DNA ligase?

Accepted Answer

A)  To carry DNA into a new cell. 
B)  To join the end of the new strand to the old one. 
C)  To make millions of copies of a specific segment of DNA for diffusion into the cytoplasm to the ribosomes. 
D)  To destroy damaged DNA. 
A)  To carry DNA into a new cell. 
B)  To join the end of the new strand to the old one. 
C)  To make millions of copies of a specific segment of DNA for diffusion into the cytoplasm to the ribosomes. 
D)  To destroy damaged DNA.

Exam 5: Genetics: a Review

At which stage of meiosis does crossing-over occur?

Sections of DNA that do not code for a final product,and which may intervene in a DNA sequence are

The most familiar form of aneuploidy in humans results in Down Syndrome or ________ _________.

Males are said to be ________ for traits carried on the X chromosome

Which of the following is NOT correct about X-linked characteristics?

You expect to find a ratio of 9:3:3:1 among the F2 offspring in which type of cross?

Which of the following processes synthesizes mRNA,tRNA,or rRNA?

Which of the following statements about DNA replication is NOT correct?

F2 offspring of a monohybrid cross involving Aa genotype show which genotype(s)?

Beadle and Tatum's mutated Neurospora were unable to grow on minimal media plus metabolites A or B,but did grow on minimal media plus metabolites C and D,indicating enzyme 2 was missing from the hypothetical pathway.

In Mendel's pea plants,round seeds (R)were dominant,and wrinkled seeds (r)were recessive.The endosperm of the pea is also either starchy,a dominant gene (S),or waxy,the recessive allele (s).If these genes are not linked,which of the following is true of a heterozygous dihybrid cross?

Which RNA molecules carry genetic information away from DNA when it is needed for the construction of a protein?

A codon is composed of _______ bases.

Which is a correct usage of phenotype and genotype?

If an egg of a worm contains 6 chromosomes,it comes from a worm that has ______ chromosomes in each body cell.

_________ _________ are enzymes derived from bacteria; they cleave double-stranded DNA at a particular site determined by the particular base sequences (recognition site)at that point.

What was the relationship between Gregor Mendel's work and the growing understanding of cells and chromosomes?

Joined sister chromatids of each pair of homologous chromosomes come into side-by-side contact or ____ to form a tetrad.

The polymerase chain reaction is

What is the function of DNA ligase?

Life: Biological Principles and the Science of Zoology

The Origin and Chemistry of Life

Cells As Units of Life

Cellular Metabolism

Organic Evolution

The Reproductive Process

Principles of Development

Architectural Pattern of an Animal

Taxonomy and Phylogeny of Animals

Unicellular Eukaryotes

Sponges and Placozoans

Radiate Animals

Acoelomorpha,Platyzoa,and Mesozoa

Polyzoa and Kryptrochozoa

Molluscs

Annelids and Allied Taxa

Smaller Ecdysozoans

Trilobites, Chelicerates, and Myriapods

Crustaceans

Support, Protection, and Movement

Chaetognaths, Echinoderms, and Hemichordates

Chordates

Fishes

Early Tetrapods and Modern Amphibians

Amniote Origins and Nonavian Reptiles

Birds

Mammals

Support, protection, and Movement

Homeostasis: Osmotic Regulation, Excretion, and Temperature Regulation

Homeostasis: Internal Fluids and Respiration

Digestion and Nutrition

Nervous Coordination: Nervous System and Sense Organs

Chemical Coordination: Endocrine System

Immunity

Animal Behavior

Animal Distributions

Animal Ecology

Filters

The most familiar form of aneuploidy in humans results in Down Syndrome or _.

You expect to find a ratio of 9:3:3:1 among the F₂ offspring in which type of cross?

F₂ offspring of a monohybrid cross involving Aa genotype show which genotype(s)?

_ _ are enzymes derived from bacteria; they cleave double-stranded DNA at a particular site determined by the particular base sequences (recognition site)at that point.