Part VI Comparative Embryology

Part VI Comparative Embryology

Directions: Before continuing further remove the last page of this packet and complete the activity as stated in the directions.

Directions: The figure below shows the development of a fish, a turtle, a chicken, a pig, and a human. Study the pictures and then answer the questions.

a. The adults look very ____________________.

b. The earliest embryos look very ____________________.

c. Which organisms are the most closely related?

1. 
   chickens and humans
   
2. 
   fish and pigs
   
3. 
   pigs and humans
   
4. 
   turtles and pigs
   

d. Which organisms are the least closely related?

1. 
   fish and turtles
   
2. 
   pigs and chickens
   
3. 
   fish and humans
   
4. 
   pigs and humans
   

e. Embryos that are most alike are those that are the ____________________ closely related.

f. Embryos that are least alike are those that are the ____________________ closely related.

Review Questions

TRUE OR FALSE


Directions: In the space provided, write "true" if the sentence is true, Write "false" if the sentence is false.

____1. Fossils found in upper rock layers are older than fossils round in lower layers.

____2. Structure means how something is used.

____3. Function means how something is used.

____4. Different animals with parts that have similar structure and function are probably distant relatives.

____5. Embryology is the study of adult organisms.

____6. Closely related embryos look more alike and for a longer time, than embryos of distant relatives.

____7. The most complete fossil record is of the horse.

____8. The wings of bees and birds are very similar.

____9. Vestigial organs have no functions.

____10. Blood proteins can show evolutionary relationships.

Directions: Read each statement. Indicate whether each statement uses anatomy (A), biochemistry (B), or embryology (E) as evidence of evolutionary relationships among organisms. Write the correct in the space provided.

____ 1. The forelimbs of a penguin and alligator have similar structures.

____2. The early stages of development in a fish, a rabbit, and a gorilla look alike.

____3. In the wing of a bat and the arm of a human, you find bones called the radius, humerus and ulna.

____ 4. Some blood proteins are found in almost all organisms.

____5. The finger bones in mammals. Have the same structure.