All partner pairs should have: 1) Dark Blue A. All dark blue B. Cross-Over 2) Light Blue A. All light blue B. Cross-Over 3) Dark Green A. All dark green B. Cross-Over 4) Light Green A. All light green B. Cross-Over

Definition Alleles: Different forms of the same gene Genotype: An organism’s genetic makeup Phenotype: An organism’s appearance Example There are multiple alleles for hair type. There is one allele for straight hair and a different version of the same gene (a different allele) for curly hair. A human might have one allele for straight hair and one allele for curly hair. A human could have curly hair.

1)With your partner create four gametes that might arise from independent assortment A. Separate homologous chromosomes (meiosis I) B. Separate sister chromatids (meiosis II) 2)Choose one lucky gamete that will go on to create an offspring A. Write down the traits of this gamete, save these two chromosomes B. Pile up the other three gametes on the side of you desk 3)Partner pairs will get into their assigned groups (2 partner pairs) A. Stay with your assigned partner, bring your chosen gamete B. Your teacher will help you get into your groups 4)Fuse the gametes in your group together. 1)What is the genotype of your offspring? 2)What is the phenotype of you offspring? 3)Which allele came from each parent? 5)He

Mendelian Genetics

 Named for Gregor Mendel, an Austrian from the 1800’s  Mendel is considered the “father of genetics”  He bred plants for different traits and made scientific observations about his results  Famous for breeding pea plants

Seven traits were tested Discoveries:  Two genes must be present for each trait (one from each gamete)  Some alleles “dominate” over other alleles

Alleles that show up in appearance are called dominant Alleles that are masked are called recessive Dominant Recessive

Make a chart listing which allele is dominant and which is recessive for each of the seven traits tested by Mendel. (pg 176)

TraitDominant Recessive Page 176

Homework Survey of Tongue Rolling: A Family Tree 1) Ask questions Can you roll your tongue? Can your parents roll their tongues? Can your maternal grandparents roll their tongues? Can your paternal grandparents roll their tongues? Can your siblings roll their tongues? 2) Complete the chart

Tongue Rollers? 1)Survey your group A. # of tongue rollers B. # of non-tongue rollers 2)Send one person to write it on the board 3)Write the ratio for the class Ex. # R : # r 4)Make a graph of the class 5)Write a conclusion Ex. Which trait is dominant and which trait is recessive?