Modification Of Body Plans Flashcards
What is Charles Darwin’s theory?
Similar organisms are related and stem from a single common ancestor
Environment changes and natural selection occurs
Best adapted individual survives
What one word describes animals structures?
Homologous : similar structure, different function
What are vestigial structures?
Reduction or loss of a structure that used to have a function but longer required
Eg. wales pelvic girdle
Human coccyx/appendix
Moles eyes
What is the body part all organism have?
Pentadactyl limb
What is descent with modification?
Develop from pre existing species over time, from a common ancestor
What is natural selection?
The survival of the best adapted
What is the function of an opposable thumb?
All primates have the ability to use it to pick things up
What is the function of elongated phalanges?
Pick up things
Mobility
What are ungulates?
No fingers as they are fused together
What are the adaptations of the mole?
Extended humerus
Flat carpels to dig
What are the adaptations of a bat?
Short humerus
Long radius, ulna and carpels to fly
What are the adaptations of a horse?
Small humerus
Fused radius and ulna
What are the adaptations of a dolphin ?
Humerus, radius and ulna are short and flat
Fins are for balance
What are the adaptations of a monkey?
Extended limbs
Flexibility at shoulder
More grip from phalanges
