1. Mrs. Anna Ward Seventh Grade Science James Martin MS

2. DO NOW!!!!

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4.  Quiz today to check for understanding  Notebook Exemplars

5.  Short video review on Punnett Squares  Quiz  Calculating Ratios from Punnett Squares  Independent Practice  Ink Think Article “Genes tell old Story”

6.  http://www.youtube.com/watch?v =d4izVAkhMPQ http://www.youtube.com/watch?v =d4izVAkhMPQ

7. In humans, brown eyes (B) are dominant to blue eyes (b). 1.What are the possible phenotypes for eye color as listed above? 2.What would the be genotype of: a)a homozygous dominant human? b)A homozygous recessive human? c)A heterozygous human? 3.Which genotype(s) would code for brown eyes? 4.Which genotype(s) would code for blue eyes? 5.Draw a Punnett Square that crosses a homozygous dominant woman with a heterozygous man. 6.What are the possible genotypes? 7.Draw a Punnett Square that crosses a heterozygous female with a homozygous recessive male. 8.What are the possible genotypes?

8.  For Monohybrid Crosses, the ratios are always going to occur in fourths, because there are four squares.  To Calculate the GENOTYPIC RATIOS, count the number of each GENOTYPE and put that over 4.  Example: The Genotypic Ratio in the figure to the right is: 1 BB to 2 Bb to 1 bb or 1:2:1 BBBb

9.  To Calculate the PHENOTYPIC RATIOS, count the number of each PHENOTYPE and put that over 4.  There are typically only two phenotypes for monohybrid crosses, the dominant & the recessive trait.  Example: The Phenotypic Ratio in the figure to the right is: 3 Brown to 1 Blue or 3:1 BBBb

10.  This is something you should be very familiar with from MATH class.  For monohybrid crosses, it is always going to be a factor of 25%, because there are 4 squares.  You can calculate the percentages based on the phenotype or genotype.  Example:  The genotype is 25% BB, 50% Bb, and 25% bb.  The phenotype is 75% brown, 25% blue. BBBb

11. Question # 1 In Rabbits, Black Fur (F) is dominant to White Fur (f). Imagine you have a Homozygous Dominant Black Male Rabbit that you are going to mate with a Homozygous Recessive White Female Rabbit. Draw the Punnett Square to predict the offspring. What is the genotype ratio? What is the phenotype ratio? Genotype Ratio: 100 % Heterozygous or Bb Phenotype Ratio: 100 % Black Fur

12. Bbbb Bbbb Question # 2 In Rabbits, Black Fur (F) is dominant to White Fur (f). Imagine you have a Heterozygous Black Male Rabbit that you are going to mate with a Homozygous Recessive White Female Rabbit. Draw the Punnett Square to predict the offspring. What is the genotype ratio? What is the phenotype ratio? Genotype Ratio: 50% Heterozygous (Bb) Rabbits to 50% Homozygous Recessive Rabbits (bb) Phenotype Ratio: 50% Black Rabbits, 50% White Rabbits

14.  Remember this from last week?  Underline or highlight things you want to remember or you deem important  Circle words you don’t know  ? Mark thinks you don’t understand  Attach the Passage in your Science Notebook.

15. In Rabbits, Black Fur (F) is dominant to White Fur (f). Imagine you have a Heterozygous Black Male Rabbit that you are going to mate with a Heterozygous Black Female Rabbit. 1.Draw the Punnett Square to predict the offspring. 2.What is the genotype ratio? 3.What is the phenotype ratio?