In a population of 500 at Hardy-Weinberg equilibrium, the frequency of allele t is 0.2. How many heterozygous Tt individuals are expected?
Correct answer A. 160
Topic / 45 questions
Evolution MCQs
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- Biological Molecules 74
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- Bioenergetics 55
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In a population at Hardy-Weinberg equilibrium, 75% of individuals show the dominant phenotype. What is the frequency of the recessive allele?
Correct answer A. 0.5
At Hardy-Weinberg equilibrium, the frequency of heterozygotes is greatest when ____.
Correct answer C. p = q = 0.5
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The rapid increase of antibiotic-resistant bacteria in hospitals is best explained by ____.
Correct answer C. selection of bacteria already carrying resistance genes
Which statement summarises Lamarck’s idea of the inheritance of acquired characters?
Correct answer A. Traits developed during an organism's lifetime are passed on to its offspring
According to Lamarck, why have snakes lost their limbs?
Correct answer C. Continuous disuse of limbs over many generations made them disappear
Weismann cut off the tails of mice for 22 generations and found every new generation still had normal tails. Which idea did this experiment challenge?
Correct answer D. Inheritance of acquired characters
Weismann’s germ plasm theory states that ____.
Correct answer B. only changes in reproductive cells can be passed to offspring
Darwin’s ideas on natural selection were developed largely from observations made during his voyage on which ship?
Correct answer A. HMS Beagle
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Which naturalist independently reached the theory of natural selection and presented it jointly with Darwin in 1858?
Correct answer B. Alfred Russel Wallace
Darwin’s idea of a ‘struggle for existence’ was strongly influenced by whose essay on human population growth?
Correct answer C. Thomas Malthus
In Darwin’s theory, which individuals are most likely to pass on their characteristics?
Correct answer B. Those with variations best suited to the current environment
Which of the following was a major weakness of Darwin’s original theory?
Correct answer B. It could not explain how variations arise and are inherited
The modern synthetic theory (neo-Darwinism) combines natural selection with ____.
Correct answer A. Mendelian genetics and mutation
Before the Industrial Revolution most peppered moths in England were pale; afterwards the dark form became common in polluted areas. This is an example of ____.
Correct answer D. directional selection
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Human birth weight shows highest survival for babies of medium weight, with very light and very heavy babies faring worse. Which type of selection does this illustrate?
Correct answer B. Stabilising selection
In a bird population, both small-beaked and large-beaked individuals survive better than those with medium beaks because only very small and very large seeds are available. This is ____.
Correct answer A. disruptive selection
Which scientist carried out the 1953 experiment in which electric sparks passed through a mixture of CH₄, NH₃, H₂ and water vapour produced amino acids?
Correct answer C. Stanley Miller
Which group of organisms is credited with adding most of the free oxygen to Earth’s early atmosphere?
Correct answer B. Cyanobacteria
The first living organisms on Earth are believed to have been ____.
Correct answer C. anaerobic heterotrophic prokaryotes