Monohybrid crosses, also called one-factor crosses, predict the possible outcomes of genetic combinations of a single trait, such as flower color.
There are six steps to completing a monohybrid cross.
- Determine the dominant and recessive forms of the allele for the trait being analyzed, and then determine what letters to use to represent the genes.
- Determine the genotypes of the parents, and write down the cross.
- Determine the alleles of the gametes that would be produced during meiosis.
- Draw and set up the Punnett square. Put the genotype of the gametes produced by both parents on the top and left sides of the table.
- Fill in the middle of the Punnett square by combining the gametes.
- Analyze the results, and determine the genotypes and phenotypes of the offspring.
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