HW: EOC Practice & HW (pg. 7 & 8) Thursday March 30, 2017 I can: solve complete dominance Punnett Square problems Agenda (10) Catalyst (15) GN: Punnett Squares (10) GP: Punnett Squares (45) Monster Genetics Lab (5) Exit Ticket Catalyst If brown eyes (B) is dominant to blue eyes (b), what is the phenotype for: (a) BB; (b) Bb; (c) bb? How would you describe the above genotypes? (homo, het, dom, rec) A person is heterozygous for brown hair color. What are their genotype and phenotype? HW: EOC Practice & HW (pg. 7 & 8) Monster Genetics Lab (if incomplete in class)

HW: EOC Practice & Homework (if not done yesterday) Friday March 31, 2017 I can: review my Unit 3 test Catalyst A mother with brown eyes (Bb) has a child with a man with blue eyes. Meanwhile, a man with blonde hair (HH) has a child with a woman with black hair (hh). Those children then meet, grow old, marry, and have children of their own. What is the genotypic and phenotypic ratio of their future children (taking into account nondisjunction and crossing over)? Agenda (5) Catalyst (40) WORK! Test Corrections Missing Work Monster Genetics Lab HW: EOC Practice & Homework (if not done yesterday)

HW: EOC Practice & Homework (if not done yesterday) Friday March 31, 2017 I can: review my Unit 3 test Agenda (5) Catalyst (40) WORK! Test Corrections Missing Work Monster Genetics Lab Catalyst Tell me one thing about yourself that I may not know. Turn your Catalyst Sheet in Grab YOUR laptop from the cart and start logging into School Net. HW: EOC Practice & Homework (if not done yesterday)

How can we predict what the offspring of two parents look like?

How can we predict what the offspring of two parents look like?

How can we predict what the offspring of two parents look like?

The principles of probability can be used to predict the outcomes of genetic crosses. What is the probability of landing on heads both times if you flip a penny twice?

What is the probability of landing on heads both times if you flip a penny twice? First we must figure out all the possible combi-nations of coin flips. H/T Which combos meet our criteria? ¼ = 25% T H H T H T T H

How to complete a Punnett Square: The allele combinations that might result from a cross can be determined by drawing a Punnett Square. father = Bb, mother = bb How to complete a Punnett Square: B b 1. Draw the Punnett Square. 2. Place the father's alleles on the top of the Punnett square, one letter per box. B b b b b 3. Place the mother's alleles on the left side of the square, one letter per box. B b b b b 4. Drop the father's alleles down into the squares and bring the mother's across. Now you have all possible allele combinations for the offspring.

Solving Genetics Word Problems The steps: The problem: Black fur in guinea pigs is dominant over white fur. If two heterozygous guinea pigs are crossed, what percentage of their children will be black? 1. Read the problem. Underline the known alleles. 2. Choose a letter to represent the alleles in the problem. 3. Circle and/or write down the genotypes of the parents. 4. Set up and solve Punnett Square. B = black (dominant) b = white (recessive) 5. Highlight and answer what the question is asking. parents: Bb x Bb 75% black

Step 5: Highlight and answer what the question is asking. The problem: Black fur in guinea pigs is dominant over white fur. If two heterozygous guinea pigs are crossed, what is the genotypic ratio of their offspring? genotypic ratio = the proportion of offspring with each genotype BB = 1/4 = 25% There is a 1:2:1 ratio of genotypes Bb = 2/4 = 50% bb = 1/4 = 25%

Step 5: Highlight and answer what the question is asking. The problem: Black fur in guinea pigs is dominant over white fur. If two heterozygous guinea pigs are crossed, what is the phenotypic ratio of their offspring? phenotypic ratio = the proportion of offspring with each phenotype black = 3/4 = 75% There is a 1:3 ratio of white to black offspring. white = 1/4 = 25% Phenotypic ratios only care about what the offspring look like!