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Exam - 35 Questions - General Genetics | BIOL 2323, Exams of Genetics

University of Arkansas (UA)Genetics

Material Type: Exam; Class: GENERAL GENETICS; Subject: Biology; University: University of Arkansas Main Campus; Term: Fall 2014;

Typology: Exams

2014/2015

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BIOL 2323 Exam 1 (Fall 2014)
!
1
Exam I
BIOL 2323 – General Genetics
Fall 2014 - Dr. Tim Evans / Dr. Ines Pinto
• There are 35 questions on this exam, and you will have 50 minutes (2:00-2:50 PM) to complete it.
• Feel free to write on this exam. HOWEVER, to receive credit, your answers need to be
recorded correctly on your Scantron sheet within the allotted exam time. You will not be
given extra time to transcribe your answers from this exam to your Scantron!
• Mark your answers to the exam questions on a blue ANSWER SHEET NO. 4521 using a No. 2
pencil. It is essential that you enter your name and university ID on the form by filling in the
bubbles on the sheet!
• Read each question and the selection of answers completely and carefully before filling in your
answer. Fill in the corresponding bubble completely without extraneous marks. If you need to
change your answer, please make sure you erase the unintended answer bubble completely.
• Folded or dog-eared sheets, extraneous marks, or incompletely erased answers may lead to
grading errors when the sheet is read. Because of the large number of students in class, we
cannot hand-check each exam for machine grading errors. Please make sure that your answers are
marked as you intend.
GOOD LUCK!
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Exam I

BIOL 2323 – General Genetics

Fall 2014 - Dr. Tim Evans / Dr. Ines Pinto

  • There are 35 questions on this exam, and you will have 50 minutes (2:00-2:50 PM) to complete it.
  • Feel free to write on this exam. HOWEVER, to receive credit, your answers need to be recorded correctly on your Scantron sheet within the allotted exam time. You will not be given extra time to transcribe your answers from this exam to your Scantron!
  • Mark your answers to the exam questions on a blue ANSWER SHEET NO. 4521 using a No. 2 pencil. It is essential that you enter your name and university ID on the form by filling in the bubbles on the sheet!
  • Read each question and the selection of answers completely and carefully before filling in your answer. Fill in the corresponding bubble completely without extraneous marks. If you need to change your answer, please make sure you erase the unintended answer bubble completely.
  • Folded or dog-eared sheets, extraneous marks, or incompletely erased answers may lead to grading errors when the sheet is read. Because of the large number of students in class, we cannot hand-check each exam for machine grading errors. Please make sure that your answers are marked as you intend.

GOOD LUCK!

  1. The link between ___________ and heredity was demonstrated using Drosophila , and pre- dated our understanding of DNA as the genetic material. A) the genetic code B) DNA C) RNA D) protein E) chromosomes
  2. A gene is: A) a sequence of nucleotides that encodes a functional RNA. B) a chromosome that carries a loss of function mutation. C) a protein that is translated from a mRNA. D) the part of a chromosome to which the mitotic spindle attaches. E) a gain of function mutation.
  3. When a gene is expressed, ________________. A) the chromosome on which it resides condenses into chromatin. B) metaphase occurs. C) its nucleic acid sequence is copied into RNA. D) a loss of function mutation is present. E) it is haplosufficient.
  4. Rabbits are diploid animals. Kevin has a pet rabbit that is homozygous for a gene called hoppy. This means that: A) the hoppy gene is haplosufficient. B) the rabbit carries only one copy of the hoppy gene. C) the rabbit displays a mutant phenotype. D) the rabbit carries two copies of the hoppy gene, and the two copies have identical DNA sequences. E) the rabbit carries two copies of the hoppy gene, and the two copies do not have identical DNA sequences.
  5. A diploid individual that carries two different alleles of the same gene is best described as a: A) haploid B) female C) heterozygote D) homozygote E) mutant
  6. Which of the following is not true of the mutant allele that causes sickle-cell disease? A) it is a mutant allele of the β-globin gene. B) it differs from the wild type allele by a single nucleotide difference. C) it is a gain of function allele. D) it produces a protein that forms aggregates within red blood cells. E) it is recessive to the wild type allele.
  1. Consider the following diagram, which shows two pairs of homologous chromosomes isolated from a single diploid mitotic cell. The maternal and paternal homologs of chromosomes 1 and 2 are labeled. In the above diagram, which of the pairs of DNA molecules (A, B, or C) best fits the following description: “These two molecules carry the same genes but may carry different alleles”? A) pair A B) pair B C) pair C D) this description fits pairs A and C equally well. E) this description does not fit pairs A, B, or C.
  2. Which of the following statements would not correctly describe a pair of homologous chromosomes? A) they carry the same genes B) they are the same length C) they have the same centromere position D) they are identical in DNA sequence E) they synapse during meiosis I
  3. Which of the following is not a true difference between mitosis and meiosis? A) homologous chromosomes pair during meiosis II, but not during mitosis. B) the number of chromosomes is reduced from diploid to haploid during meiosis, but not during mitosis. C) crossing over occurs during meiosis, but not during mitosis. D) mitosis produces two diploid daughter cells, but meiosis does not. E) there are two rounds of division during meiosis, but only one during mitosis. !"#$%&"'( )%+!,(-( ."#$%&"'( )%+!,(-( !"#$%&"'( )%+!,(/( ."#$%&"'( )%+!,(/(

A B C

  1. “Crossing over” refers to a reciprocal exchange of genetic material between _____. A) gametes B) sister chromatids C) non-sister chromatids D) non-homologous chromosomes E) both A and B are correct
  2. During anaphase I, which of the following events occurs? A) sister chromatids separate and migrate towards opposite poles B) crossing over occurs between homologous chromosomes C) chromosomes decondense into chromatin D) homologous chromosomes segregate away from each other towards opposite poles E) the cell’s DNA is replicated
  3. “True breeding” is a synonym for __________. A) dominant B) recessive C) haplosufficient D) heterozygous E) homozygous
  4. One of Mendel’s monohybrid crosses involved crossing true-breeding tall pea plants with true-breeding dwarf pea plants. Which of the following accurately describes the initial (P1) cross from this experiment? A) Dd x Dd B) DD x DD C) dd x dd D) DD x dd E) both B and C are correct.
  5. A 3:1 phenotypic ratio is characteristic of the _____ generation of a _____ cross. A) P1, true-breeding B) F1, monohybrid C) F2, monohybrid D) F1, dihybrid E) F2, dihybrid
  1. In summer squash, white fruit (W) is dominant over yellow (w), and disk-shaped fruit (D) is dominant over sphere-shaped fruit (d). A cross between a plant producing white, disk fruit and a plant producing yellow, sphere fruit gives 1/2 white, disk and 1/2 white, sphere. The genotypes of the parents are: A) WWDd x wwdd B) Wwdd x Wwdd C) wwDD x WWdd D) WwDd x Ww dd E) WwDd x wwdd
  2. After taking General Genetics, you decide to get rich quick by breeding albino ball pythons in the comfort of your own home. First, you acquire a normally pigmented female specimen that you suspect is a carrier of the albino allele. You borrow an albino male from one of your new snake-breeding friends and allow the two snakes to mate. When the eggs resulting from this mating hatch, you observe that three of the baby snakes have normal pigmentation and two of them are albino. What can you conclude about the genotype of your female snake? A) she is a carrier of the albino allele B) she is homozygous for the wild type allele C) she is homozygous for the albino allele D) she is heterozygous for the gene in question E) both A and D are correct
  3. In fruit flies, purple eye color is inherited as a recessive Mendelian trait. You have set up a cross between males and females that are all carriers of the purple allele, and collect 480 of their offspring. How many of these do you expect to show the purple eye phenotype? A) 0 B) 48 C) 120 D) 240 E) all 480 offspring will show the purple eye phenotype.
  4. How many gamete types can be produced by an individual with the genotype DDEeFf? A) 2 B) 4 C) 8 D) 16 E) 32
  5. A male with the genotype AaBbCC is crossed to a female with the genotype AaBbCc. Which of the following is not a possible genotype for one of their offspring? A) aaBBCc B) AaBbCc C) aabbCC D) AABBcc E) aaBbCc

  1. How many gamete types can be produced by an individual that is heterozygous for four genes (i.e. AaBbCcDdEd)? A) 4 B) 8 C) 16 D) 32 E) 64

  2. The ebony phenotype in fruit flies (in which flies display black body pigmentation) exhibits a Mendelian pattern of inheritance. What does this tell us about the ebony phenotype? A) it is determined by two different alleles of the same gene B) fruit flies carry two copies of the gene responsible for the ebony phenotype C) the alleles of the ebony gene exhibit complete dominance D) either the ebony phenotype or the wild type phenotype must be recessive E) all of the above

  3. In the dihybrid cross AaBb x aabb, how many homozygotes are found among the F offspring? A) all B) 1/ C) 1/ D) 3/ E) 1/

  4. Among the dihybrid crosses below, which will give a 1:1:1:1 ratio? A) AABB x aabb B) AaBb x AaBb C) AaBb x aabb D) AaBB x aaBB E) AAbb x aaBB

  5. Consider the three gene pairs Aa, Bb, and Cc, each of which affects a different character. What is the probability of obtaining a zygote AaBBCc from the cross AaBbCc x AaBbCc? A) 1/ B) 1/ C) 9/ D) 1/ E) 1/

  6. In a standard monohybrid cross, what is the probability that an F2 individual displaying the recessive phenotype is a heterozygote? A) 0% B) 25% C) 50% D) 75% E) 100%