Question

27) a) We considered the question of whether predators control population numbers of their prey or not. Briefly describe (1 sentence) two situations in which predators would not be the primary factor regulating numbers of their prey in ecological time (2.5 points each).

b) Name or briefly describe one of the 5 types of natural selection that we studied. For the type of selection that you identify, briefly explain (a word, a few words, or a brief sentence) whether or not the mean of the trait we are studying (e.g., bill length) is shifted in the population due to this type of selection, and how variation of this trait is affected in the population as a whole due to this type of selection. For some types of natural selection, you may need to clarify whether you are discussing short term or long term effects.

Answer 1

Yes predators control population number of their prey.

Two situation in which predators would not primary factor are-

The predators population increases and prey population growth decreases. Vice versa.

The prey population relies on the predator population to keep their community in control and predators rely the prey in their food source.

Types of natural selection

Directional selection

Stabilizing selection

Disruptive or diversifying selection

Kin selection

Sexual selection

This trait very fast directional selection from the shape of the approximate it's either right or left by varriying degrees it has more one direction or the other, they colouring favoured mimic.

Disruptive selection skew when individual are plotted on a graph.

Stabilizing selection skew bell curved that select skin colour light skin or darked this is usually caused by incomplete or codominance

Sexual selection skew phenotype ratio choose makes of group trait, fitness of males judge on the basis of attractiveness will reproduce more progeny.

Kin selection are choosing to mimics natural natural deciding which trait are favourable or not human selects more beneficial. Galapagos island which had unique beak shaped.