FORUM DESCRIPTION Think about the following crosses: 1) monohybrid showing complete dominance, 2) dihybrid showing complete dominance, 3) monohybrid showing incomplete dominance, 4) codominance (specifically ABO blood types), and 5) x-linked recessive crosses. For each type of cross, answer the following questions: • How many genes are involved? • How many alleles are involved? • How many characters are involved? • How many traits are involved? • How are you able to distinguish this cross from the other crosses? For example you may want to discuss phenotypes and/or ratios that you would expect at each generation for certain parents.
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This cross is an example of (check all that apply): incomplete dominance, pleiotropy, codominance, recessive lethal allele, dominant epistasis, recessive epistasis, multiple alleles of genes. Depending on the number of genes you think are involved, use the symbols A or a, B or b, D or d, E or e, F or f for the first, second, third, etc. genes. Using these symbols (e.g: AAbbDdEEff), what is the genotype of the original grey plant? Depending on the number of genes you think are involved, use the symbols A or a, B or b, D or d, E or e, F or f for the first, second, third, etc. genes. Using these symbols (e.g: AAbbDdEEff), what is the genotype of the original black #1 strain?
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Chapters 14 and 15 1. Mendelian concepts of inheritance 2. Monohybrid and dihybrid cross phenotype ratios. 3. What is a test cross and what genotype is used? 4. Understand how inheritance patterns deviate from simple Mendelian genetics? a. Incomplete dominance b. Co-dominance c. Multiple alleles d. Pleitropy e. Epistasis f. Polygenic 5. Be able to recognize an example of epitasis 6. Be able to determine the mode of inheritance in a pedigree. Dominant, recessive or x-linked
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Create a Punnett square for the following crosses and use this to predict phenotypic ratio for dominant and recessive traits. Dominant alleles are indicated by uppercase letters and recessive are indicated by lowercase letter. For part (b) predict ratios using probability and the product rule (multiplication rule) a. A monohybrid cross between individuals with the genotype Aa and Aa b. A dihybrid cross between two individuals with the genotype AaBb Assuming incomplete dominance, a monohybrid cross AA x aa would yield: a. A phenotypic ratio of b. A genotypic ratio of
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