lecture_11__05 - What is a "genetic cross"? An...

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What is a “genetic cross”? An experimental mating of selected parental strains (organisms) based on particular genetic traits A genetic cross involves meiosis in each parent, and fertilization of gametes to yield zygotes. Parent 1 Parent 2 gametes gametes zygotes If there is more than one type of gamete from either parent, there will be more than one type of zygote produced
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Representations of a genetic cross only include the relevant loci and alleles. Example: the B locus 2n, diploid cells B B b b fertilization B b B b b B b B 2n zygotes meiosis meiosis + B B + b b the “P generation” the “F1 generation”
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the Mom vs Dad designations of homologous chromosomes usually (other than some interesting exceptions) has no effect on character traits, so we won’t show Mom vs. Dad. All of the F1 generation from the B genetic cross are genetically identical. B b B b F1 generation F1 generation meiosis meiosis + B b + B b fertilization B B B b b B b b F2 generation
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the F2 generation is defined as the mating products of F1 individuals with other F1 individuals the easiest way to determine the products in
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lecture_11__05 - What is a "genetic cross"? An...

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