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Mendel day 2
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Fast Plants Read the background and purpose Tally your data
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Punnett squares: Axes Represent genotypes of each parent
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Grid Boxes Show all possible genotypes of offspring inside the grid box
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Monohybrid Cross R R r Rr Rr r Rr Rr
Examines the inheritance of one specific trait R R r Rr Rr r Rr Rr
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ratio R R r Rr r Rr Rr 0:4:0 for RR : Rr : rr 4
Genotype- Homo Dom : Hetero: Homo recessive How many do you have of each genotype… How many homozygous Dominant do we have? How many heterozygous do we have? How may homozygous recessive do we have? 0:4:0 for RR : Rr : rr 4 R R r Rr r Rr Rr
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Phenotype ratio 4 Dom : Rec
If big R is dominant for red and little r is recessive for white… How many red offspring are there? How many white offspring are there? Ratio? 4: Red: White 4
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Dihybrid Cross Examines the inheritance of two traits at the same time
16 grid boxes Skipp with standard! Or find beeter way to explain - Do more practice with monohybrid cross
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F.O.I.L
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Before we draw this double punnet square…
Our two traits will be color and size R is still dominant for Red and r is still recessive for white T is now dominant for tall and t is recessive for short Parent 1: RRTT Parent 2: Rrtt
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To find the four options for the top and sides, we need to use the foil method (First Outer Inner Last) to find the four alleles for each parent: RRTT RT RT RT RT Rrtt Rt Rt rt rt Crossing the different alleles in ONE parent Add section to notes to practice F.O.I.L
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RT RT RT RT Rt rt Rt rt RRTt RRTt RRTt RRTt RrTt RrTt RrTt RrTt RRTt
ADDDDD to notes!!!!!! rt RrTt RrTt RrTt RrTt
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Ratios: gento Genotype How many RRTt? How many RrTt? 8 : 8 RRTt : RrTt
Dom: rec How many RRTt? How many RrTt? 8 : 8 RRTt : RrTt
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Ratios: phenotype 16 How many white and small?
How many white and tall? How many red and small? How many red and tall? Pheno: most Dom most rec 16
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Law of Independent Assortment
Inheritance of one trait does not influence the inheritance of a second trait Traits are inherited independently
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Lets practice Use the manipulatives to F.O.I.L. and complete the dihybrid cross on the table. You are working in pairs. When finished and checked by Ms Beck, Start working on the practice example on the BACK of your notes!
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Lets Practice
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Dihybrid cross Classwork
C – using level 2 voices H- ask three before me (raise your hand to get my attention) A- complete even # Mendel genetics review WS on table with markers provided (odd on own) M- remain seated (butt on the stool) P- work with your table partner SUCCESS Add how to determine parent genotypes from given offspring
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Exit ticket why or why not it is correct: in a dihybrid cross of HhGg X HhGg, where H is dominant for Hair and h is recessive for bald and G is dominant for green skin and g is recessive for yellow skin, there is a 9:4:2:1 ratio for the different genotypes
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