A characteristic that helps an organism survive

How well an organism can survive and reproduce in their environment

Different organisms have lots of different traits. They are called ______

Organisms that are best suited for their environment will survive longer and reproduce. They will pass on their traits.

When two organisms have body parts that have the same function, but are not arranged the same way

When two organisms have body parts that are arranged in similar ways. They also might have similar functions.

A body part that has no function, but may have been useful for the organism's ancestors

Studying embryos to look for similarities in how different species develop

Studying these allows us to compare organisms that are alive today to organisms that are extinct

The leg structures of many different vertebrates are quite similar in number and location of bones. Most scientists would probably explain this on the basis of what idea?

selection by humans for breeding of useful traits

formation of a new species

similar organisms do not mate because they act differently

similar organisms do not mate because they are separated physically by a barrier

similar organisms do not mate because they breed at different times

___________ is the random change in allele frequency caused by a series of chance occurrences that cause an allele to become more or less common in a population

___________ is all the genes, including all the different alleles for each gene, that are present in a population at any one time

Which type of speciation involves a physical barrier that creates geographic isolation?

Behavioral, temporal, and habitat isolation are pre-zygotic barriers that involve which type of speciation?

Which scientist first published the idea of natural selection based on his observation of organisms in the Galapagos Islands?

Populations of a species may become new species over time if there is

The sperm cells of some sea urchins often reach sea urchins of different species however there is no fertilisation. This would be an example of

Insects are unable to mate with other species of insects due to the vast differences in morphology of their sex organs. This is an example of

Hybrid unviability results in organism that are unable to develop into mature individuals. For example, goat and sheep zygotes die in early developmental stage before birth.

This scenario is an example of

What type of natural selection is this: When a group of deer migrated to a cold mountain, the thin-furred deer and average-furred deer died. The thick-furred deer survived and eventually the population became thicker-furred.

The images are examples of ?

The femur and pelvis bones in the organism are examples of trace organs/structures that are no longer useful. This is an example of...?

Jaguars with slightly larger jaws and teeth are better able to eat shelled reptiles in addition to mammals. These Jaguars are likely to survive longer and leave more offspring than jaguars that eat only mammals. Which scientific concept explains how large jaws and teeth became typical characteristics of jaguars?

A flash flood carried a raft of Amazon ants away from their original population. There is enough distance between the two groups, that they will never meet in nature again. What type of isolation is this?

Which of the following is NOT true in the formation of a new species?

You are researching reptiles and encounter two garter snakes on a hike. Both snakes are brown and white, but their patterns are slightly different. You bring them back to the lab for further study. What is the BEST way to determine if these two are the same species?

A population of fruit bats is active at night. Part of the population is most active from 8pm to midnight, and the rest of the bats eat from 1am to 5am. Eventually, the bats don't interact with each other at all. What type of isolation is this?

Some female peacocks prefer males with large, colorful tales while other female peacocks prefer males with no tail at all. Females are beginning to only mate with the type of males with the tail they prefer. What type of isolation is this?

The flowers of pink tulips open in the morning, while the flowers of lavender tulips open in the early afternoon. The bees that pollinate these tulips cannot carry pollen back & forth between the two types of tulips because of their flowers being closed at different times of day. What type of isolation is this?