DE_LE_3.5.3

DE_LE_3.5.3_What Do Morphological and Developmental Homologies Tell Us about Common Ancestry?

By NickBeth Meyer

Match

Vocabulary Matching

• shared ancestry of biological structures

  
  

• a process by which two unrelated organisms will share similar features due to the similar pressures of natural selection

• suggests species experience long periods of stability (stasis) interrupted by brief episodes of rapid change and speciation

• organisms adapting to their environment due to fitness traits which leads to survival and reporoductive success

homology

convergent evolution

punctuated equilibrium

natural selection

• homology

• convergent evolution

• punctuated equilibrium

• natural selection

Open Ended

What do you notice? What do you think homology refers to?

Match

Match the following embryos to the correct species

snake

chicken

possum

cat

human

• snake

• chicken

• possum

• cat

• human

Open Ended

What developmental homologies (similarities) do you see between the fish, salamander, tortoise, chicken and human?

Open Ended

What traits are similar between these four species?

Open Ended

Different classes of animal have converged on a similar solution: the wing

What does convergent evolution mean?