Independent assortment Recombination Monogenic or monohybrid Digenic or dihybrid Hybrids Diagnostic ratios Probability Predictable ratios such as 3:1 or 1:2:1 based on dominance and recessiveness. Two different traits coded for by two different genes. The likelihood of an event occurring such as Mendelian inheritance ratios. Exchange of alleles during Meiosis I Prophase I. A lined diagrammatic approach following probabilities of each trait in a multigenic cross. Trait coded for by a single gene. Standard ratios resulting from known patterns such as Mendelian inheritance.
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Recombination: Exchange of alleles during Meiosis I Prophase I. Monogenic or monohybrid: Trait coded for by a single gene. Show more…
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Adi S.
Mendel used his experimental data to determine how alleles are passed on through gametes to offspring. The law of segregation states that gametes receive only one of two alleles from parents. The law of independent assortment states that alleles on different chromosomes will separate into gametes independently of one another. These two laws can be used to predict the probability that certain alleles will be passed on from parent to offspring. They can also be used to predict the genotype and phenotype of offspring. Punnett Squares are useful when completing monohybrid or dihybrid crosses. But, when you are doing more than 2 traits at a time, it becomes too complicated to use a Punnett square. When doing multiple hybrid crosses, one can use the following formula. If n equals the number of traits/genes in question, then: Number of F1 gamete types 2n Proportion of F2 homozygous recessives 1/(2n)2 Number of different F2 phenotypes (complete dominance) 2n Number of different F2 genotypes (or phenotypes, if no dominance) 3n
Madhur L.
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