What factor is important in minimizing the impacts of genetic drift? A.Mutation

Question

What factor is important in minimizing the impacts of genetic drift?

A.Mutation rate

B.B. Population size

C. Generation time of the organism

D.D. None of the above; the effects of genetic drift are constant across all populations.

Which statement about Lack's experiments on clutch size is true?

A.They demonstrated ecological trade-offs.

B.They measured Charnov's dimensionless ratio (c).

C.They showed that the life histories of birds vary depending on their geography.

D. Both a and c

Which statement about the r–K continuum is true?

A.It only applies to mammals.

B.It applies only to organisms with a complex life cycle.

C.It involves an ecological trade-off.

D.It involves only organisms that display phenotypic plasticity.

Explanation / Answer

Ans 1 - (B) population size

Genetic drift occurs in all populations of non-infinite size, but its effects are strongest in small populations.

Ans 2 - (A) They demonstrates ecological trades off

A trade-off exists when one trait cannot increase without a decrease in another (or vice versa). Such a situation can be caused by a number of physical and biological mechanisms. This mechanism states that for a given amount of resource (e.g., energy, space, time), it is impossible to increase two traits at once.

For example : A trade-off between the size and number of eggs, a bird can produce in a given clutch. Depending on the organism, this trade-off can be caused by a limitation in the amount of energy available, the amount of time available to produce eggs or the amount of space available to hold eggs. Similarly, time spent foraging may be time wasted with respect to finding a mate. Trade-offs also occur when characteristics that enhance one aspect of performance necessarily decrease another type of performance.

Ans 3 - (C) it invoves ecological trade-off.

It relates to the selection of combinations of traits in an organism that trade-off between quantity and quality of offspring.

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