Dihybrid crosses Two loci with two autosomal recessive traits   Gene symbols              a          apterous wing size                                     A         normal wing size                                     s           sepia eye color                                     S          red eye color Be careful, S and s look alike when hand written The parents were apterous, red eyed color female and normal wing size, sepia eyed coloredmale  (figure out the genotypes) Diagram of P1 cross: You are crossing AaSs with AaSs. Diagram of F1 cross: Give expected F2 phenotypic ratio: Give expected F2 genotypic ratio:

Biology: The Unity and Diversity of Life (MindTap Course List)
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Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
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Chapter14: Chromosomes And Human Inheritance
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Problem 6SQ: Choose the statement that is incorrect. a. A son can inherit a recessive allele on an X chromosome...
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III. Dihybrid crosses Two loci with two autosomal recessive traits   Gene symbols              a          apterous wing size                                     A         normal wing size                                     s           sepia eye color                                     S          red eye color Be careful, S and s look alike when hand written The parents were apterous, red eyed color female and normal wing size, sepia eyed coloredmale  (figure out the genotypes) Diagram of P1 cross: You are crossing AaSs with AaSs. Diagram of F1 cross: Give expected F2 phenotypic ratio: Give expected F2 genotypic ratio:   IV. Other dihybrid cross Gene symbols              v          vestigial wing size                                     V         normal wing size                                     s           sepia eye color                                     S          red eye color The parents were vestigial, red eyed color female and normal wing size, sepia eyed color male Diagram of P1 cross: You are crossing F1s. Diagram of F1 cross: Give expected F2 phenotypic ratio: Give expected F2 genotypic ratio: Conclusion Complete a Chi Square analysis for each of the crosses. Clearly state why you expected the F2 ratios.  State if the hypothesis was accepted or rejected.  If it was rejected, hypothesize why it many not have worked.  
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