In relation to natural selection, which of the following birds would be considered to be the most fit?

In relation to natural selection, which of the following birds would be considered to be the most fit?

In a population of organisms, certain individuals pass on their alleles with more frequency than other individuals. What type of selection would increase or decrease a trait, such as size, in an entire population over generations?

In a population of organisms, certain individuals pass on their alleles with more frequency than other individuals. What type of selection would increase or decrease a trait, such as size, in an entire population over generations?

A petri dish contains a population of cells. One of these cells acquires a DNA mutation which enables it to grow and divide much more rapidly than the other cells around it. Which of the following statements best characterizes the mutation?

A petri dish contains a population of cells. One of these cells acquires a DNA mutation which enables it to grow and divide much more rapidly than the other cells around it. Which of the following statements best characterizes the mutation?

A species of seagull migrates into the region in which a crab population lives. This type of seagull has never lived in this particular environment before. The seagulls eat crabs, and begin to prey on the crab population. The smallest of the crabs are able to successfully hide under rocks and avoid being eaten by the seagulls. The largest of the crabs are too big to fit inside of the seagulls' beaks, so the seagulls learn not to try to eat them. Over time, the seagulls prey on the medium sized crabs, and only the smallest and largest members of the initial crab population survive.

Which type of selection does the described situation model?

A species of seagull migrates into the region in which a crab population lives. This type of seagull has never lived in this particular environment before. The seagulls eat crabs, and begin to prey on the crab population. The smallest of the crabs are able to successfully hide under rocks and avoid being eaten by the seagulls. The largest of the crabs are too big to fit inside of the seagulls' beaks, so the seagulls learn not to try to eat them. Over time, the seagulls prey on the medium sized crabs, and only the smallest and largest members of the initial crab population survive.

Which type of selection does the described situation model?

A population of sloths lives in a forest. New trees start to take over the forest, and these new trees make it easier for sloths with longer arms to climb them. The sloths with longer arms survive longer and produce more offspring than their shorter-armed counterparts. The sloths with the shortest arms die quickly and do not produce many offspring.

What can you predict will happen to the average arm length of the sloths in this population over time?

A population of sloths lives in a forest. New trees start to take over the forest, and these new trees make it easier for sloths with longer arms to climb them. The sloths with longer arms survive longer and produce more offspring than their shorter-armed counterparts. The sloths with the shortest arms die quickly and do not produce many offspring. Over time, the average arm length of the sloth population increased.

Which type of natural selection is modeled in the described scenario?