Chapter 20- Patterns of Genetic Inheritance Notes

Chapter 20- Patterns of Genetic Inheritance Notes -...

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September 30, 2010 Chapter 20 Genetically Inherited Traits -widow’s peak -earlobes attached or unattached -short or long fingers Genotype Gene- genetics Type- graphical presentation Genotype- specific genes for a particular trait written with symbols -Alleles: alternate forms of a specific gene at the same position(locus) on a gene (e.g. allele for unattached earlobes and attached lobes); alleles occur in pairs -Dominant Gene: will be expressed and will mask a recessive gene (Tt or TT) -Recessive allele: allele that is only expressed when a gene has two of this type of allele -Homozygous dominant genotype: 2 dominant alleles (TT or AA) -Homozygous recessive genotype: 2 recessive alleles (tt or aa) -Heterozygous genotype: one dominant allele and one recessive allele (Tt or Aa) Phenotype-the physical or outward expression of the genotype Genotype Phenotype EE unattached earlobe Ee unattached earlobe ee attached earlobe Crosses -consideration of inheritance of one characteristic and there is possibility for
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This note was uploaded on 02/25/2012 for the course BIO 2400 taught by Professor Mclean during the Fall '09 term at Texas State.

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Chapter 20- Patterns of Genetic Inheritance Notes -...

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