Question 1

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 aaE) A) and D)
F) A) and C)

Question 2

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.E) B) and C)
F) A) and C)

Question 3

A codon is composed of _______ bases.

Accepted Answer

A)   two
B)   three
C)   four
D)   sixE) None of the above
F) C) and D)

Question 4

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.E) All of the above
F) A) and B)

Question 5

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.F) A) and D)
G) None of the above

Question 6

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

Accepted Answer

A)   codominant
B)   polygenic
C)   hemizygous
D)   homozygousE) All of the above
F) C) and D)

Question 7

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

Accepted Answer

trisomy 21

Question 8

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 crossE) B) and C)
F) A) and C)

Question 9

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

Accepted Answer

A)   Translation
B)   Transcription
C)   Transposition
D)   None of the choices are correctE) B) and C)
F) A) and B)

Question 10

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.E) A) and B)
F) A) and C)

Question 11

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)   synapseE) B) and C)
F) None of the above

Question 12

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.E) A) and D)
F) All of the above

Question 13

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.E) A) and B)
F) A) and C)

Question 14

_________ _________ 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 15

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 roleE) None of the above
F) All of the above

Question 16

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.E) A) and B)
F) A) and C) C

Question 17

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 phenotypeE) All of the above
F) B) and C)

Question 18

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 transcriptE) A) and B)
F) None of the above

Question 19

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)   24E) B) and C)
F) B) and D)

Question 20

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 divisionE) All of the above
F) B) and D) A

Exam 5: Genetics: a Review

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

Correct AnswerverifiedShow Answer

What is the function of DNA ligase?

Correct AnswerverifiedShow Answer

A codon is composed of _______ bases.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answerverifiedtrisomy 21

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The polymerase chain reaction is

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

_________ _________ 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.

Correct AnswerverifiedRestrictio...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedC

Which is a correct usage of phenotype and genotype?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

At which stage of meiosis does crossing-over occur?

Correct AnswerverifiedA

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

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

Correct Answer
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trisomy 21

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

Correct Answer
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_ _ 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.

Correct Answer
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Restrictio...
View Answer

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C

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A