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Genetics: Mendel and Beyond

Genetic Definitions. inheritancegenelocusallelecharactertrait. Classical Genetics. accepted that characters are inheritedwas unclear concerning mechanismblended inheritanceparticulate inheritance. Classical Genetics. to test which was trueused flower color in pea plants (purple and whit

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Genetics: Mendel and Beyond

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    1. Genetics: Mendel and Beyond

    2. Genetic Definitions inheritance gene locus allele character trait

    3. Classical Genetics accepted that characters are inherited was unclear concerning mechanism blended inheritance particulate inheritance

    4. Classical Genetics to test which was true used flower color in pea plants (purple and white) mated purple flowering pea plant with a white flowering pea plant What would blended inheritance predict? What would particulate inheritance predict?

    5. Classical Genetics results all offspring were purple or white flowering pea plants conclusion particulate inheritance supported

    6. Gregor Mendel chose true-breeding plants for studies crossed true-breeding purple flowering pea plant with white flowering pea plant (parental generation)

    8. Mendel crossed offspring from P generation (F1 generation) 3:1 (purple:white) flowering pea plants (F2 generation) How did the white trait reappear?

    9. Explanation organisms inherit 2 genes (1 from mother, 1 from father) each parent has 2 copies of the flower color gene, 1 purple and 1 white each parent produces gametes (sex cells) that contain only one gene law of segregation

    10. Explanation

    11. Explanation one allele may be dominant over another the blending idea is not supported by the 3:1 flower color ratio

    13. Mendelian Genetics Terminology dominant vs. recessive true breeding vs. hybrid phenotype vs. genotype homozygous vs. heterozygous

    19. Verification test cross cross unknown genotype with homozygous recessive genotype

    21. Law of Independent Assortment the alleles of 2 or more pairs of different characters segregate independently of one another during gamete formation

    22. Illustration dihybrid cross both parents are double heterozygotes

    25. Allele Variation from mutation wild-type vs. mutant allele genes may have multiple alleles that control phenotype

    27. Variations to Dominance codominance incomplete dominance pleiotropy

    30. Epistasis one gene masks the expression of a different gene for a different trait epistasis is not the same as dominance

    31. Sex Linkage autosomes vs. sex chromosomes may be X-linked or Y-linked

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