GEGE2001 Quiz 3

Michael Jardine
Quiz by , created over 1 year ago

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Michael Jardine
Created by Michael Jardine over 1 year ago
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Question 1

Question
DNA replication: 1. Was first observed in Darwin’s finches 2. Must be accurate in order to transmit the genome to the next generation 3. Is accurate in germ cells and error prone in somatic cells 4. Must include some errors in order to produce variation
Answer
  • 2 and 4
  • 3 and 4
  • 1 and 2
  • 1 and 3
  • 1 only

Question 2

Question
Photoreactivation
Answer
  • Does not occur in humans due to the use of sunscreens
  • Causes a bulge in the DNA helix
  • Repairs pyrimidine dimers
  • Utilises UV light for photolyase activity
  • Uses UV light and visible light sequentially

Question 3

Question
Siamese cats show a range of coat colours on a single individual because:
Answer
  • Coat colour is a polygenic trait with many genotypes possible in the breed
  • The breed was originally formed by the mating of a pale coat cold-climate cat and a brown coat warm-climate cat
  • Frequent somatic mutation occurs in the TYR genes when cats are not kept warm
  • Cats arise from the fusion of 2 or more zygotes causing genetic mosaicism
  • They are homozygous for a missense mutation in TYR that produces a heat sensitive tyrosinase protein

Question 4

Question
The _ori_T on the plasmid
Answer
  • Facilitates phage DNA entry to the recipient
  • Was the first gene to evolve on the F plasmid
  • Initiates expression of the pilus genes
  • Is the origin of gene transfer in conjugation
  • Encodes the state of origin helper protein

Question 5

Question
All types of Transposable Elements (TEs) have
Answer
  • Either inverted repeats or long terminal repeats at the ends
  • A copy and paste mechanism for movement
  • pol and gag genes
  • RNA genomes
  • Antibiotic resistance genes

Question 6

Question
In cattle, blood groups are
Answer
  • None of the other answers
  • Quantitative traits as there are discrete classes of cattle in the population
  • Qualitative traits as there are not discrete classes of progeny as a result of various matings
  • Quantitative traits as there are discrete classes of progeny as a result of various matings
  • Qualitative traits as there are discrete classes of progeny as a result of various matings

Question 7

Question
Transgressive segregation is
Answer
  • The presence of hybrids that are intermediate between two parent lines
  • The origin of F2 and subsequent progenies which are intermediate between two parent types
  • The origin of F2 and subsequent progenies which are either superior or inferior to the parents they are derived from
  • The presence of hybrids that are superior to the best parent
  • None of the other answers

Question 8

Question
Heritability is
Answer
  • Will have a different value in males and females
  • None of the other answers
  • Specific to a trait in a population in a specific environment
  • For a particular breed of animals has the same value for all quantitative traits
  • Can only have a maximum value of 0.5 or 50%

Question 9

Question
Heterosis is
Answer
  • The presence of hybrids that are intermediate between two parent lines
  • None of the other answers
  • The origin of F2 and subsequent progenies which are intermediate between the two parent types
  • The origin of F2 and subsequent progenies which are either superior or inferior to the parents they are derived from
  • The presence of hybrids that are superior to the best parent

Question 10

Question
Heritability
Answer
  • Is the chi-squared value in testing a 3:1 ratio
  • None of the other answers
  • Is not related to the statistical relationship between the trait measures in various relatives
  • Can be measured by the regression of the trait in the offspring and their parents
  • Is another way of measuring the recombination fraction in cM