 What is an acquired trait?  A trait that an organism acquires or gains over its lifetime. It cannot be passed on to its offspring. Like the ability a monkey has to peel a banana.  What is an inherited trait?  A trait that is passed to offspring because of genetic inheritance. Could be good or bad for the organism.

 What are some examples of traits that make an organism MORE suited to its environment?  What are some examples of traits that make an organism LESS suited to its environment?

 Blue eyes  Dog’s short fur  Broken arm  Blonde hair  A Cold  Sun tan  Colorblindness  Ability to roll tongue  Love of music  Ability to do math well

 When environments changed, organisms had to change their behavior to survive. If they began to use an organ more than they had in the past, it would increase in its lifetime. If a giraffe stretched its neck for leaves, for example, a "nervous fluid" would flow into its neck and make it longer. Its offspring would inherit the longer neck, and continued stretching would make it longer still over several generations. Meanwhile organs that organisms stopped using would shrink.  Is this true?

 In your group of 3, time each person for 10 seconds while they pick up toothpicks one by one.  Make a chart in your notes of how many toothpicks of each color each person picked up. PersonBrownRedYellow Leonardo Donatello Michaelangelo

 Count how many butterflies you can spot on the wall  Count how many butterflies you can spot on the floor

 Write down 5 adaptations animals have that help them survive in their environment.  Write down 5 traits that you have inherited from your parents.

 Two ways to inherit traits. Most organisms reproduce with one or the other, not both.  Asexual reproduction  Sexual reproduction  Both use genetic information (DNA) to create offspring

 The DNA of the parent is the same as the offspring.  Any genetic mutation (whether good or bad) will be passed onto the offspring.

 A better system for producing genetic variation and therefore “fitness” for an environment  ½ of the DNA from one parent and ½ from the other parent

 Advantages  More opportunity for mutations  More DNA combinations  Disadvantages  Sometimes takes longer  Some bad genes are still possible

 Double  ½ genes on one side  ½ genes on other side  Sex cells have ½

 Read pg C as a class.  Make an example of an offspring’s DNA in asexual and sexual reproduction.  Follow the example on the board.