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Genetics and Heredity Part III. Every path has its puddle. English proverb. Today’s Agenda. Dihybrid crosses Incomplete dominance Codominance Polygenic. Dihybrid SetUp PpSs X PpSs. Dihybrid SetUp PpSs X PpSs. PS. Dihybrid SetUp PpSs X PpSs. PS. Ps. Dihybrid SetUp PpSs X PpSs. pS.

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Genetics and heredity part iii

Genetics and Heredity Part III

Every path has its puddle.

English proverb


Today s agenda
Today’s Agenda

  • Dihybrid crosses

  • Incomplete dominance

  • Codominance

  • Polygenic







Dihybrid setup ppss x ppss5
Dihybrid SetUp PpSs X PpSs

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Obj 9 incomplete dominance
Obj. 9 Incomplete Dominance

  • Definition:

  • A condition in which a trait in an individual is intermediate between the phenotype of the two parents because the dominant allele is unable to express itself fully.


Example of incomplete dominance
Example of Incomplete Dominance:

  • Red snapdragon X white snapdragon

  • All offspring are pink snapdragons


Codominance
Codominance

  • Definition: a condition in which both alleles for a gene are fully expressed.

  • Ex. Blood Types


Polygenic
Polygenic

  • Definition: a characterisitc of an organisms that is determined by many genes

  • Ex. Eye color, height, weight


Multiple alleles
Multiple Alleles

  • Genes with three or more alleles

  • Example: Blood groups

  • A = AO, AA

  • B = BO, BB

  • AB = AB

  • O = OO



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