Blog # 4 Describe the three types of selection: directional, stabilizing and disruptive and give an example of each in your own words
Direction is choosing one thing only. The trait favors one that it likes. So it is kind of like its personally choosing the trait
Stabilizing -When selective pressures select against the two extremes of a trait, the population experiences stabilizing selection. For example, plant height might be acted on by stabilizing selection. A plant that is too short may not be able to compete with other plants for sunlight. However, extremely tall plants may be more susceptible to wind damage. Combined, these two selection pressures select to maintain plants of medium height. The number of plants of medium height will increase while the numbers of short and tall plants will decrease.
Disruptive selection pressures act against individuals in the middle of the trait distribution. The result is a bimodal, or two-peaked, curve in which the two extremes of the curve create their own smaller curves. For example, imagine a plant of extremely variable height that is pollinated by three different pollinators, one that was attracted to short plants, another that preferred plants of medium height and a third that visited only the tallest plants. If the pollinator that preferred plants of medium height disappeared from an area, medium height plants would be selected against and the population would tend toward both short and tall, but not medium height plants. Such a population, in which multiple distinct forms or morphs exist is said to be polymorphic.
Type of community interaction is competition. Competition is an interaction between species or organisms and the fitness of one is lowered by the presence of the other. Competition can occur when the species are competing in the same area for a limited food supply or when they must share limiting resources. Species less suited to compete for resources either adapt or die out. That is why if something is off the food chain, it could majorly hurt the species.
Community interaction is commensalism. Commensalism is a relationship between 2 organisms where one organism benefits from the other, but the other organism is not harmed but also does not benefit from the relationship. An example of commensalism is like the relationship between the sun and the plants. The plants benefit from the sun's sunlight, but the sun does not benefit from the plants, nor is it harmed by the plants. Us humans, need the plants to produce oxygen for us to breathe. Without it, our body's would intake all the bad air.
Over the past year, i have learned that Biology is eveywhere. From species to atoms, everything is releated to science. It is amazing how we find fossils from millions of years ago. My Question is why the Sea turtle's life longer than a human's life? I find that strange because humans usually live longer than most species. Humans live around 70-90 years.
The most important is grain, having grain in your body is good. It fills you up because its a whole type of food. Grain could be created into many type of foods like noodles, pasta and rice. That goes really well with side dishes, so we can be full. With having food in our stomach, we will have tons of energy for later.
Yes, humans hunt and polute the world which the animals, insects, repetiles or any other thing live in. If you think about fishermen, they catch a load of fishes for markets. Hunters hunt for the joy of it. If that keeps up, many will be extinct and soon our world will not have a well working food chain. The only way to fix is this is to hunt less, we do neede these resources to survive.
