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Published byBernardo Bracewell Modified over 10 years ago
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GENETICS
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Gregory MENDEL WHO? Father of Genetics = Pea Plants
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Independent Assortment Genes that segregate independently, do NOT influence each other’s inheritance. Separate genes for separate traits are passed independently of one another from parents to offspring
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Dominant vs. Recessive Traits
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DominantRecessive
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DominantRecessive
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DominantRecessive
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DominantRecessive
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DominantRecessive
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DominantRecessive
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DominantRecessive
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DominantRecessive
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Some alleles are neither dominant nor recessive, and many traits are controlled by multiple alleles or multiples genes.
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Incomplete Dominance Where one allele is not completely dominant over another. Heterozygous phenotype is somewhere in between the two homozygous phenotypes.
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Codominance Both alleles contribute to the phenotype (physical characteristics). Both alleles are FULLY EXPRESSED.
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Multiple Alleles Genes that have more than 2 alleles. More than 2 possible alleles exist in the population.
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Polygenic Traits Traits controlled by two or more genes. Traits that are produced by the interaction of several genes.
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The FOIL method is ONLY used when finding the gametes from parents with two traits. Use the FOIL method to find the gametes: (RrYy)
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(R + r)(Y + y). F tells you to put the FIRST of the two traits’ alleles together. RY
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(R + r)(Y + y). O tells you to put the OUTER alleles together. Ry
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(R + r)(Y + y). I tells you to put the INNER alleles together. rY
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(R + r)(Y + y). L tells you to put the LAST alleles together. ry
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Remember, FOIL reminds you to match up the: F irst alleles O uter alleles I nner alleles L ast alleles
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