Why the Heck are we doing this FACE

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

How many genes do you have? 1 2 4 23 46 2, 300 3, 200 32, 000 1. 2. 3. 4. 5. 6. 7. 8. 25 Seconds Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 16 17 18 19 20

Where are these traits (GENES) located? Chromosomes In Parents Cellular Membrane DNA 1. 2. 3. 4. 25 Seconds Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 16 17 18 19 20

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

Genotypes o The combination of genes that make up a genotype can be either n Homozygous o o n Both genes are either dominant or both are recessive Example: RR or dd Heterozygous o o 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 1. 2. 3. 4. 5. 25 Seconds Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 16 17 18 19 20

Which genotype is heterozygous? Cleft Chin CC No Cleft Chin Cc 1. 2. 3. 4. 25 Seconds Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 16 17 18 19 20

Which phenotype is homozygous dominant? CC Cleft Chin Cc No Cleft Chin 1. 2. 3. 4. 25 Seconds Remaining 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 16 17 18 19 20

Self Quiz 1. 2. 3. 4. 5. 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 o Dominant/Recessive n o Co-Dominant/Incompletely Dominant n o Type of inheritance where there is a pure dominant allele and pure recessive allele Type of inheritance where the alleles are equal or mostly equal. There is not a pure dominant or pure recessive allele Polygenic n Type of inheritance where there is more than one gene that controls the trait.

Face Lab Conclusion o o o WARNING: This is a “quality” assignment, you must get a B or you will get it back for corrections. Label the traits on the face lab as D/R, Co. D or Poly. Tell the story of how genes are passed on to make facial traits. Use a specific example along with the words below. n n n Meiosis Genes Chromosome Genotype Phenotype

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

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

Problem o 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? o What are the possible phenotypes and the chances?