Variation：练习题

Which factor is the primary cause of discontinuous variation?

Which sequence of events correctly describes the development of antibiotic resistance in a population of bacteria?

A student collects data on the leaf lengths of 500 oak trees. When the data is plotted on a frequency diagram, it forms a bell-shaped curve.
Which statement about this variation is correct?

Which type of variation results in a range of phenotypes between two extremes, such as human height?

Which of the following are significant sources of genetic variation in a population?

State the definition of a mutation.

Identify two external factors that can increase the rate of mutation in living cells.

State three sources of genetic variation in populations, excluding mutation.

Variation is a fundamental concept in biology that explains the differences seen within a population.
(a) Define the term variation.
(b) Distinguish between continuous variation and discontinuous variation, providing one example of each type.

Genetic variation is necessary for populations to adapt to changing environments.
(a) Define the term gene mutation.
(b) List three different sources of genetic variation in a population, other than mutation.
(c) State one factor that can increase the rate of mutation in an organism. <\/p>