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The Amino acid sequences from the animals are for cytochrome c, a protein that carries oxygen. Based on the chart, which organism has more amino acids that differ from the gorilla

• chicken

• iguana

• bullfrog

• shark

Scientists often use gel electrophoresis to analyze similarities in DNA samples. A band appears when a gene is present in a sample. Bands shared on the same horizontal line repersent shared DNA sequences. Based on the gel image below which statement is correct?

• Organisms 1 and 4 are most closely related

• Organisms 3 and 6 are most closely related

• Organisms 3 and 5 are most closely related

• organisms 5 and 7 are most closley related

Look at the graph below. What reproductive barrier appears to keep bullfrogs from mating with leopard frogs.

• habitats

• breeding season

• hybrids are sterile

• geographic isoloation

Which of the following best describes how Darwin would explain giraffes with long necks

• Long-necked giraffes eat more grass than short-necked giraffes so their neck grows larger.

• Natural variation in the population produces some larger and some shorter neck giraffes and longer-necked giraffes can reach food more easily so they pass on their gene.

• Some giraffes have acquired longer necks by stretching to reach food and passed that trait on.

• Giraffes started out with long necks and have not changed over time

Which statement provides the best argument for why bird and butterfly wings evolved to have a similar action but different structures?

• This is an example of embryological structures, which indicates that bird and butterfly wings have similar functions because they develop the same way

• This is an example of analogous structures, which indicates that they are not closely related even though they perform the same function

• This is an example of Vestigial structures, which indicates that the common ancestor of birds and butterflies had the same structure as birds

• This is an example of homologous structures, which indicates that they share a common evolutionary origin.

Which term is used to refer to structures that have similar origin or ancestry even though they may have different appearance

• analogous

• homologous

• genes

• fossils

Differences in the species are most likely a result of

• strength of mating season

• population size

• color of feathers

• available food sources

amino acid sequences from the animals are for cytochrome c, a protein that carries oxygen. Based on the chart, which two animals probably evolved from the most recent common ancestor

• gorilla and chicken

• chicken and iguana

• iguana and bullfrong

• bullfrog and the shark

This model shows the effects of pesticides on an insect population. What role did natural selection most likely play in this situation

• Some of the insects became stronger due to the pesticide

• The pesticide affected the very young and the very old insects

• Some of the insects had mutations that made them resistant to the pesticide

• The pesticide caused mutations in some of the insects that allowed them to survive

The existence of these two types of vegetables is an example of...

• artificial selection

• genetic draft

• natural selection

• speciation