Part 1
In this lab, we asked the question "If natural selection occurs in a population, how do changes in selective pressures affect the evolution of that species?" We found that if there are individuals with better traits leave more offspring, then the tweezer beaks will survive and pass on their genes. The tweezer beak produced 18 offspring, which was the most amount of offspring produced by a certain bird in the group. The tweezer's beak was far more accurate to pick up food and it was the easiest to use to pick up food. This lead to the tweezer getting a lot of food/energy so it could produce lots of offspring.
We also found that if the population looks like the winners, then the tweezer beaks will become dominant in the population. The tweezer beak's offspring made up 37% of all of the offspring in the group. The spoon made up 8%, the binder clip chicks made up 20% and the scissor chicks made up 35%. The tweezer chicks are slowly making up a bigger percentage of all of the offspring, because they are the "winners" since they are reproducing the most.
Part 2
In this lab, we asked the question "If natural selection occurs in a population, how do changes in selective pressures affect the evolution of that species?" The tweezer beak collected 7 seed pot plants or approximately 2 chicks in part 1. If the seed pot plants died out, then we will see a slight decrease in the tweezer beak chicks. Our hypothesis was not supported, and in fact there was an increase in tweezer chicks. The tweezer beaks produced 23 chicks in part 2. This is five more offspring than it produced in part 1. This meant that the shortage of food did not negatively affect the tweezer beaks.
Our data was unexpected because shortage in food usually leads to a decrease in energy and offspring, but the tweezer beaks saw an increase in offspring.There could have been some errors. First, this lab required a little bit of practice for the humans who were simulating the beaks, and so they could have gotten much better with using their beaks as the lab progressed. This could have lead to the increase of tweezer chicks in part 2 instead of a decrease, because I became more skilled with picking up other types of food. Second, sometimes everyone "ate" food for different times because we were not aware when the music started and stopped exactly. This would change the amount of offspring by at least 1. Due to these errors, in future experiments I would recommend having everyone rotate which "beak" they used and counting before starting/ stopping the music.
This lab was done to demonstrate Charles Darwin's main observations and conclusions. From this lab, I learned how evolution occurs which helped me understand how there are winners and losers in the population. I also better understand how the gene pool changes. Based on my experience in this lab, I better understand how Darwin's conclusions are the results of evolution.
In this lab, we asked the question "If natural selection occurs in a population, how do changes in selective pressures affect the evolution of that species?" We found that if there are individuals with better traits leave more offspring, then the tweezer beaks will survive and pass on their genes. The tweezer beak produced 18 offspring, which was the most amount of offspring produced by a certain bird in the group. The tweezer's beak was far more accurate to pick up food and it was the easiest to use to pick up food. This lead to the tweezer getting a lot of food/energy so it could produce lots of offspring.
We also found that if the population looks like the winners, then the tweezer beaks will become dominant in the population. The tweezer beak's offspring made up 37% of all of the offspring in the group. The spoon made up 8%, the binder clip chicks made up 20% and the scissor chicks made up 35%. The tweezer chicks are slowly making up a bigger percentage of all of the offspring, because they are the "winners" since they are reproducing the most.
Part 2
In this lab, we asked the question "If natural selection occurs in a population, how do changes in selective pressures affect the evolution of that species?" The tweezer beak collected 7 seed pot plants or approximately 2 chicks in part 1. If the seed pot plants died out, then we will see a slight decrease in the tweezer beak chicks. Our hypothesis was not supported, and in fact there was an increase in tweezer chicks. The tweezer beaks produced 23 chicks in part 2. This is five more offspring than it produced in part 1. This meant that the shortage of food did not negatively affect the tweezer beaks.
Our data was unexpected because shortage in food usually leads to a decrease in energy and offspring, but the tweezer beaks saw an increase in offspring.There could have been some errors. First, this lab required a little bit of practice for the humans who were simulating the beaks, and so they could have gotten much better with using their beaks as the lab progressed. This could have lead to the increase of tweezer chicks in part 2 instead of a decrease, because I became more skilled with picking up other types of food. Second, sometimes everyone "ate" food for different times because we were not aware when the music started and stopped exactly. This would change the amount of offspring by at least 1. Due to these errors, in future experiments I would recommend having everyone rotate which "beak" they used and counting before starting/ stopping the music.
This lab was done to demonstrate Charles Darwin's main observations and conclusions. From this lab, I learned how evolution occurs which helped me understand how there are winners and losers in the population. I also better understand how the gene pool changes. Based on my experience in this lab, I better understand how Darwin's conclusions are the results of evolution.
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