Welcome to another Bio-Ninja Friday. Quiz today Welcome to another Bio-Ninja Friday. Quiz today. Have your sketches ready to discuss! 1 Set up Journals for Notes: Page 33 Title: Gene Expression EQ: How does the environment affect the expression of genes in an organism? 2 Read the article at your table. Write and answer the following questions in your notes section using information from the reading. What is a gene? What is gene expression? What are two things that regulate gene expression? The article compares gene expression to what common device? 3

Notes suckas…. What is a gene? A gene is a segment of DNA that codes for a trait What is gene expression? Gene expression is a term referring to whether or not the traits a gene codes for “show up” or not. What are two things that regulate gene expression? Two factors that regulate gene expression are heredity and the environment. The article compares gene expression to what common device? Gene expression is compared to a light switch. Heredity and the environment can determine whether a gene is "turned on or off”

Important Dates… Last day to turn in the codon face assignment for credit is today. All Classes: Vocabulary project is due Tuesday. This is a TEST grade. Do not mess this up for yourself. DNA structure, Replication, Transcription, Translation, Mutations, Central Dogma Pre-AP only:

And now…gene expression

Temperature & Gene Expression

Water level affects the size of the leaves. Phenotypes are always affected by their environment. In buttercup (Ranunculus peltatus), leaves below water-level are finely divided and those above water-level are broad, floating, photosynthetic leaf-like leaves. Siamese cats are darker on their extremities, due to temperature effects on phenotypic expression. Expression of phenotype is a result of interaction between genes and environment. Siamese cats and Himalayan rabbits both animals have dark colored fur on their extremities. This is caused by an allele that controls pigment production being able only to function at the lower temperatures of those extremities. Environment determines the phenotypic pattern of expression. http://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookgeninteract.html Leaves above water are broad, below the water-level are finely divided

pH affects color. Acidic soil produces blue flowers and Alkaline soil produces pink.

Video Examples You will use the worksheet you picked up to answer questions about how the environment affects gene expression in each of the video examples. Add the definition below to your notes: Epigenetics is the study of biological mechanisms that will switch genes on and off.

Lactose Tolerance Turtles Turtle Lays Eggs Rabbits

What is a gene?

How environment affects our genes….

Epigenetics…

Twins

Epigenetics

Can you inherit behavior?

D-News: Change your genes

Epigenetics: Extra time

What is a gene?

D-News: Change your genes

Epigenetics

Epigenetics: Rats

Neil Degrasse Tyson

Epigenetics

HW - Twin Studies Video Quiz Tomorrow over T/T and Video What is the genetic make up of identical twins? What have we found out about the expression of the genes in twins? http://www.pbs.org/wgbh/nova/body/epigenetics.html http://www.npr.org/templates/story/story.php?storyId=15629096

In 1917 the biologist Thomas Hunt Morgan conducted studies in which he kept some caterpillars in the dark and placed other under red, green, or blue lights. Exposure to red light produced butterflies with brightly colored wings. Exposure to green light resulted in dark-colored wings. Exposure to blue light or no light resulted in pale-colored wings. What was the most likely conclusion of Morgan’s research? The pigment in butterfly wings absorbs light from the environment The phenotypic expression of wing shape depends on color pigmentation in butterflies. The genes regulating wing color in butterflies are influenced by environmental factors. Caterpillars exposed to red and green light are healthier than caterpillars exposed to no light or blue light.