“Why the Heck are we doing this FACE LAB?” Question: List the traits you have inherited (that you were given from your parents) Did you get to pick your traits?

How many genes do you have? 1 2 4 23 46 2,300 3,200 32,000 25 Seconds Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Where are these traits (GENES) located? 15 Seconds Remaining Chromosomes In Parents Cellular Membrane DNA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Remember! You get 1 chromosome per trait from your mom. You get 1 chromosome per trait from your dad. Therefore, you have chromosome(s) per trait.

Look at your lab Why are there two letters written for each trait? Each letter represents a gene from each parent Capital Letters represent DOMINANT genes Lower case represent recessive genes

Face Shape A combination of letters represents the combination of genes that were inherited. This is a GENOTYPE. What does Rr look like for face shape? Round – R is dominant allele What does rr look like for face shape? Square – r shows up because it is the recessive allele How the genes actually look expressed in the organism is called its PHENOTYPE.

Genotypes The combination of genes that make up a genotype can be either Homozygous Both genes are either dominant or both are recessive Example: RR or dd Heterozygous There is each type of gene is represented Example: Rr or Dd

What are the possible genotypes for Chin Shape? CC cc Cc All of the above None of the above Seconds Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Which genotype is heterozygous? 15 Seconds Remaining Cleft Chin CC No Cleft Chin Cc 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Which genotype is homozygous? CC Cleft Chin Cc No Cleft Chin 15 Seconds Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Self Quiz What was your kid’s genotype for widow’s peak? What are the possible phenotypes for eye size? W= Green Leaves & w = white leaves in corn plants. If a corn plant is Ww, then what would its phenotype be? Is the corn plant in question #3, heterozygous or homozygous? Where do the corn plants get their genes?

Types of Inheritance Dominant/Recessive The gene has a Dominant and Recessive form Co-Dominant/Incompletely Dominant Both forms of the gene are equal or nearly equal You see a blending of the traits when they are together Multiple Allele More than two forms of a gene. Blood-type is an example

Face Lab Conclusion Tell the story of how genes are passed on to make facial traits. Use a specific example along with the words below. Meiosis Genes Chromosome Genotype Phenotype

Predicting which gene you get Face Shape = R: (Alleles = R – Round, r - Square) Parent #1 genotype is Rr Parent #2 genotype is rr They want to have a child: Parent #1 can pass on a or Parent #2 can pass on a or To keep everything straight we use a PUNNETT SQUARE

What is the chance that my kids gets my gene for Round face shape What is the chance that my kids gets my gene for Round face shape? (I am Rr) 25% 33% 50% 85% 100% 25 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

Punnett Square Each Box is worth a 25% or 1 out of 4 R r r r R r r r R Parent #1 Parent #2 Each Box is worth a 25% or 1 out of 4 R r R r r r r r R r r r

Problem You have two heterozygous parents that each have Almond shaped eyes. They are having a baby. What are the possible genotypes it could have and the possibility of getting each one? What are the possible phenotypes and the chances?