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OBJ: explain the principle of independent assortment. Explain how Mendel’s Principles apply to all organisms. KEY TERMS Independent assortment incomplete dominance codominance multiple alleles polygenic traits . DO NOW .

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do now

OBJ: explain the principle of independent assortment. Explain how Mendel’s Principles apply to all organisms.

KEY TERMS

Independent assortment incomplete dominance codominance multiple alleles

polygenic traits

DO NOW

Create a Punnett Square for a father who is homozygous recessive for tall gene and a mother who is heterozygous. What percent of their offspring will be tall?

independent assortment
Independent Assortment
  • Two factor cross F1 and F2
  • Wanted to know if the recessive traits and dominant traits would group back together
  • The F2 generation of Mendel’s two factor cross produced seeds of both parents phenotypes as well as a large portion with mixed phenotypes
  • Alleles for the different traits segregated independently, known as independent assortment.
independent assortment cont
Independent Assortment (cont)
  • The principle of independent assortment states genes for different traits can segregate independently during the formation of gametes.
  • Helps account for the many genetic variations observed in plants, animals, and other organisms.
mendel s principles
Mendel’s Principles
  • The inhertiance of biological characteristics is determined by individual units known as genes. Genes are passed from parent to offspring.
  • In cases in which two or more forms (alleles) of the gene for a single trait exist, some forms of the gene may be dominant and others may be recessive.
mendel s principles1
Mendel’s Principles
  • In most sexually reproducing organisms, each adult has two copies for each gene- one from each parent. These genes are segregated from each other when gametes are formed.
  • The alleles for different genes usually segregate independently from one another.
not dominant or recessive
Not Dominant or Recessive
  • Incomplete dominance
    • Neither trait is dominant over the other
    • Heterozygous phenotype is a combination of the two homozygous
codominance
Codominance
  • Both alleles contribute to the phenotype
  • Both traits appear separately on the organism
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