Question

directional selection
how does directional selection work?
now that the evidence is in place, you need to ask yourself, how does this directional selection happen? you know that individual finches don’t automatically just grow larger beaks. so how does a population where only a small portion of large - beaked birds exist lead to a population where an overwhelming majority has large beaks?
which of the following requirements have to be in place to make the number of finches with the large - beak trait increase drastically over many years?
select all that apply.
□ large - beaked finches had better chances of survival since they were able to eat the available seeds.
□ large - beaked finches had better chances of reproducing since they were able to survive long enough to reproduce.
□ large - beaked finches could pass down that trait to their offspring, who would have a chance of inheriting the large - beak trait.

Explanation:

Directional selection occurs when individuals with a particular trait have higher survival and reproductive success. For the large - beak trait in finches to increase: large - beaked finches must have better survival (to eat available seeds), better reproductive chances (due to longer survival for reproduction), and be able to pass the trait to offspring.

Answer:

Large - beaked finches had better chances of survival since they were able to eat the available seeds.
Large - beaked finches had better chances of reproducing since they were able to survive long enough to reproduce.
Large - beaked finches could pass down that trait to their offspring, who would have a chance of inheriting the large - beak trait.