Dihybrid Cross Dihybrid Cross Aladdin and Jasmine want

Dihybrid Cross

Dihybrid Cross �Aladdin and Jasmine want to have a child. Aladdin is homozygous for brown hair and brown eyes. Jasmine is homozygous for black and black eyes. Perform a test cross and predict the possible genotypes and phenotypes for their offspring. (BBlack hair; b-brown hair) (E- black eyes; e- brown eyes)

Dihybrid Cross �Step ◦ ◦ 1 - Create a Key B: black hair b: brown hair E: black eyes e: brown eyes

Dihybrid Cross �Step 2: Identify the parent genotypes ◦ Aladdin: homozygous for brown hair and eye �_____ ◦ Jasmine: homozygous for black hair and eyes �_____

Dihybrid Cross �Step 2 a- Number the parent alelles: ◦ bbee x BBEE �Aladdin: b 1 b 2 e 3 e 4 �Jasmine: B 1 B 2 E 3 E 4 Aladin: 1 -3 _______ 1 -4 _______ 2 -3 _______ 2 -4 _______ Jasmine: 1 -3 ______ 1 -4 ______ 2 -3 ______ 2 -4 ______

Dihybrid Cross �Step 3 a: Labeling the punnett square �Aladin is on top of the box Aladin: 1 -3 (be) 1 -4 (be) 2 -3 (be) 2 -4 (be) be be

Dihybrid Cross �Step 3 b: label the side of the punnett square �Jasmine : BBEE be be be Jasmine be : 1 -3 (BE) 1 -4 (BE) 2 -3 (BE) 2 -4 � BE BE

Dihybrid Cross �Step 4: Fill in all 16 boxes with the possible gametes from the cross ◦ Each box will have 4 letters or 2 traits Aladin: 1 -3 (be) 1 -4 (be) 2 -3 (be) Jasmine 2 -4 : (be) 1 -3 (BE) 1 -4 (BE) 2 -3 be (BE ) (B E) (BE) be be be

Dihybrid Cross �Step 5: List all possible genotypes and phenotype ratios be be be BEbe BEbe BEbe BEbe BE BE BEbe be BE �BEbe, BEbe , BEbe,

Dihybrid Cross Conclusion � All 16 traits were BEbe, which is Heterozygous for Black Hair and Black eyes �Genotype: _______ �Phenotype: ___________ �Happily Ever After ◦ The End