When two heterozygotes (genotype Aa) mate, the dominant trait will appear in both the F1 and F2 generations because dominant alleles mask recessive ones whenever they are present. F1 Generation: By definition, the F1 generation refers to the first set of offspring from a set of parents. In a cross of Aa x Aa, approximately 75% of the offspring will possess at least one dominant allele (AA or Aa) and will therefore display the dominant trait. F2 Generation: The F2 generation is produced by crossing members of the F1 generation. Since the F1 contains individuals with dominant alleles, their subsequent crosses will continue to produce offspring that express the dominant trait in the standard Mendelian 3:1 phenotypic ratio.
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