Michael Jardine
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Michael Jardine
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GEGE2001 Quiz 2

Pregunta 1 de 10

1

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

Selecciona una de las siguientes respuestas posibles:

  • 1 and 3

  • 2 and 4

  • 1 only

  • 1 and 2

  • 3 and 4

Explicación

Pregunta 2 de 10

1

Photoreactivation

Selecciona una de las siguientes respuestas posibles:

  • Repairs pyrimidine dimers

  • Uses UV light and visible light sequentially

  • Causes a bulge in the DNA helix

  • Utilises UV light for photolyase activity

  • Does not occur in humans due to the use of sunscreens

Explicación

Pregunta 3 de 10

1

Siamese cats show a range of coat colours on a single individual because:

Selecciona una de las siguientes respuestas posibles:

  • They are homozygous for a missense mutation in TYR that produces a heat sensitive tyrosinase protein

  • 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

  • Cats arise from the fusion of 2 or more zygotes causing genetic mosaicism

  • Frequent somatic mutation occurs in the TYR genes when cats are not kept warm

Explicación

Pregunta 4 de 10

1

Microsatellites used as genetic markers because:

Selecciona una de las siguientes respuestas posibles:

  • They can be assayed by PCR and size separation of the DNA fragment amplified

  • None of the other answers

  • They give inconsistent results

  • They always have high rates of recombination when assayed with visible markers

  • They are very rare

Explicación

Pregunta 5 de 10

1

Genetic maps

Selecciona una de las siguientes respuestas posibles:

  • None of the other answers

  • In humans are circular, not linear

  • Cannot be used to make predictions in pedigrees

  • Can be given in units of cM (centiMorgans)

  • Have no relationship to genetic recombination

Explicación

Pregunta 6 de 10

1

The Hardy-Weinberg Equilibrium always results in:

Selecciona una de las siguientes respuestas posibles:

  • Constant gene and genotype frequencies from generation to generation

  • 25%, 50%, and 25% as the frequencies of the three genotypes AA, Aa, and aa respectively in all cases

  • A tendency for the dominant allele to go towards fixation

  • A reduction in the frequency of heterozygotes

  • None of the other answers

Explicación

Pregunta 7 de 10

1

Inbreeding

Selecciona una de las siguientes respuestas posibles:

  • Changes gene frequencies quickly

  • Results in a stable frequency of heterozygotes

  • None of the other answers

  • Results in the frequency of heterozygotes being halved each odd generation

  • Can only be done in plants, not animals

Explicación

Pregunta 8 de 10

1

In a certain human population, colour-blindness is 20X more frequent in males than females. This means that:

Selecciona una de las siguientes respuestas posibles:

  • 9.5% of the females are carriers of the colour-blindness gene

  • The allele for colour-blindness has a frequency of 0.5

  • There is selection on this characteristic

  • Females can not be colourblind

  • 0.25% of the females are not colour-blind

Explicación

Pregunta 9 de 10

1

When a population is small, the effect is:

Selecciona una de las siguientes respuestas posibles:

  • Higher mutation rates

  • None of the other answers

  • That gene frequencies will change at random over time, and certain alleles may become fixed

  • Heterozygotes will steadily increase in frequency

  • That recessive alleles will always disappear

Explicación

Pregunta 10 de 10

1

In a population mutation from the A to a allele has a frequency of 0.0001, while the reverse mutation rate is 0.0009. What is the equilibrium frequency of the a allele?

Selecciona una de las siguientes respuestas posibles:

  • 0.1

  • Two of the other answers (a joke for you all – please do not choose this as the correct answer!)

  • 0

  • 10/11

  • 1.0

Explicación