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Section 6-5 Part 2 Dihybrid Crosses

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1 Section 6-5 Part 2 Dihybrid Crosses
Write everything that is Yellow

2 Recall … Phenotype: The way an organism looks
Black, white, tall short Genotype: The gene combination of an organism Homozygous Dominant, Heterozygous Homozygous recessive

3 Monohybrid Crosses: Dihybrid Crosses: A cross that involves
Parents differ by just one trait (flower color) Dihybrid Crosses: A cross that involves 2 different traits (flower color AND plant height)

4 Naming Dihybrid Crosses
Traits are written together in pairs All dominant traits are written first So, if a plant’s genotype is heterozygous tall (Tt) and heterozygous round (Rr), it would be written TtRr

5 Dihybrid Punnet Square
In dihybrid crosses there are 4 possible allele combinations from each parent Each combination gets its own column or row

6 Setting up a Dihybrid Punnet Square Write all of this …
Example Cross: TtRr x TTRR TR Tr tR tr TR TR TR TR

7 Filling in the Square TR Tr tR tr TR TTRR TTRr TtRR TtRr

8 Results: Phenotypes: All offspring are tall and round TTRR TTRr TtRR
Genotypes: TTRR = 4 TTRr = 4 TtRR = 4 TtRr = 4 Phenotypes: All offspring are tall and round

9 Remember the The Law of Independent Assortment:
Genes for different traits are inherited independently of each other When you have 2 or more different traits they are not “stuck” together

10 Example ll – long hair BB – Black Bb – Black bb - white
LL – short hair Ll – short hair ll – long hair

11 BbLl Bb- Black Ll – short hair
What are the genotypes of the offspring? What are the phenotypes? BbLl Bb- Black Ll – short hair

12 BbLL BbLl BBLL BBLl BBLl BBll BbLl Bbll bbLL bbLl BbLL BbLl Bbll bbLl bbll BbLl

13 BbLL BbLl BBLL BBLl Bbll BBll BbLl BBLl bbLl BbLL bbLL BbLl BbLl bbll Bbll bbLl

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