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AP Biology
Chapters 14 and 15
14
Biology
11th Grade
12/07/2008

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Term
Genotype
Definition
The genetic makeup of an organism.
Term
Phenotype
Definition
The physical trait being expressed in an organism.
Term
Homozygous
Definition
Having to identical alleles for a given gene.
Term
Heterozygous
Definition
Having two different alleles for a given gene.
Term
Dominant
Definition
Allele fully expressed in a heterozygote.
Term
Recessive
Definition
An allele whose phenotype is not expressed in a heterozygote.
Term
True-breeding
Definition
Plants that produce offspring of the same variety when they self-pollinate.
Term
Polyploidy
Definition
Having more than two sets of chromosomes.
Term
Locus
Definition
A specific location on a chromosome.
Term
Epistasis
Definition
When one gene alters the phenotypic affect of another gene.
Term
Pleiotropy
Definition
Ability of a single gene to have multiple effects.
Term
Pedigree
Definition
Family tree showing the occurence of traits over several generations.
Term
New combinations of linked genes are due to...
Definition
Crossover
Term
If x and y are crossed and the offspring is a blend of the two, what is the genetic explanation?
Definition
Incomplete dominance.
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