HL Bio - Unit 2: Dihybrid Cross

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5 Terms

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Segregation

Separation of alleles in a gene so only one is inherited 

  • Segregation must happen during some time of Gamete Formation

  • diploid —> haploid

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Independent Assortment

Segregation of alleles of two genes so that the outcome with each gene will have no effect on the outcome of the other 

  • Some genes don’t assort independently because theyre on the same chromosomes - but unlinked ones can be 

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Monohybrid Cross

Test the inheritance of a single gene (3:1) or (1:1)

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Dihybrid Cross

Test the joint inheritance of two genes (9:3:3:1)

  • The inheritance of one does not influence the inheritance of the other 

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Steps of making a dihybrid Punnett Grid

  1. Find the genotypes of the parents

  2. Deduce the genotypes of gametes that the parents can produce. - one copy of each gene is present in every gamete

  3. Draw a grid with one row for each genotype of female gamete and one column for each genotype of each male gamete 

  4. Label each row and column with the genotype of the gamete - two alleles, one for each gene 

  5. Fill each cell in the grid with the genotypes from row and column headings

  6. Indicate each phenotype resulting from the genotype in each cell

  7. Count the number of each phenotype to determine the ratios of the offspring