Ch 11 The Basic Principles of Heredity pg 2

Ch 11 The Basic Principles of Heredity pg 2 - Alleles...

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2. first filial generation or F(1) generation = the offspring of crossing plants 3. Second filial generation or F(2) generation = from a cross between F1 individuals or by self pollination of F1 individuals 4. Discovery of dominant and recessive traits a. dominant- traits mask recessive ones when both are present in the same individual 5. Debunking blending inheritance a. discovery of dominance not consistent with blending inheritance [male and female gametes’ liquids blend during reproduction to pass onto offspring] b. two fluids blend = difficult to imagine how they separate c. Today, hereditary factors = Genes! I.
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Unformatted text preview: Alleles separate before gametes are formed; the principle of segregation A. Alleles- alternative forms of a gene Dominant allele- always expressed when it is present, regardless of its state Recessive allele- never expressed in a heterozygous state B. Principle of Segregation- before sexual reproduction occurs, 2 alleles carried by an individual parent must become segregated C. Recessive alleles are not lost and can occur in the F2 generation because of meiosis II. Mendels Model of Inheritance A. Alternative forms (alleles) of a factor (gene) account for variations in inherited traits....
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This note was uploaded on 01/08/2010 for the course BIO 01-119-10 taught by Professor D'arville during the Fall '09 term at Rutgers.

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Ch 11 The Basic Principles of Heredity pg 2 - Alleles...

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