BIO 2133 Lecture Notes - Lecture 2: Punnett Square, Mendelian Inheritance, Phenotype
15 Sep 2016
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Document Summary
Chi-squared analysis of mono-hybrid, di-hybrid, and tri-hybrid crosses of different phenotypes and genotypes of fly"s using the flylab software. Monohybrid, dihybrid, and trihybrid crosses are used to determine the genotypic and phenotypic ratios of offspring after mating two individuals, these were first tested by mendel using punnett squares. A monohybrid cross is made when mating two individuals that have different alleles at one locus. In contrast a dihybrid cross is made when mating two individuals that have different alleles at two genetic loci, and a trihybrid cross is different alleles at three genetic locus of interest. A testcross is used when there is a known dominant phenotype and the genotype is unknown. This is achieved by breeding organisms that have the dominant phenotype with an individual that is homozygous recessive for the trait. An allele for a specific trait can be dominant or recessive.
