Evidence of common ancestry PMA

Two different species of organisms would demonstrate molecular homology if they –

• exhibited similarities in their amino acid sequence.

• had bones that looked similar under the microscope.

• depended on the same nutrients to survive.

• possessed body structures performing the same task.

Two populations of a species of flightless bird became separated by a river and the birds became two different species. How would scientists be able to discover that the two species of birds share a common ancestor? Scientists can look for similarities in -

• body coverings.

• genetic similarities.

• food choices.

• mating rituals.

Some snake embryos have small buds resembling limbs. These buds disappear at later stages of embryonic development. These observations suggest that these snakes –

• will have offspring with limbs.

• had a parent with working limbs.

• have functional limbs as adults.

• evolved from a limbed ancestor.

A chart comparing the base sequences of homologous segments of DNA from various primates is provided. The information in the chart can be used to conclude that which pair of organisms have the most recent common ancestor?

• Chimpanzees and baboons

• Chimpanzees and lemurs

• Gorillas and chimpanzees

• Gorillas and baboons

Which of the following can be concluded from the evolutionary tree provided?

• All three species became more complex over time.

• The differences are greatest between species B and C.

• There is evidence of large gaps in the fossil record.

• The common ancestor was most similar to species C.