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Chapter 14
Chapter 14 pg. 251
22
Biology
11th Grade
02/23/2011

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Term
Character
Definition
heritable feature
Term
Trait
Definition
each variant of a character such as flower color
Term
Hybridization
Definition
mating or crossing of two true-breeding varieties 
Term
True-breeding
Definition
when true-breeding plants self pollinate all of their offspring are the same variety
Term
law of segregation
Definition
two alleles for a heritable character separate during gamete formation and end up in different gametes
Term
homozygous
Definition

pair of identical alleles for a character

[image]

Term
heterozygous
Definition

two different alleles for a gene

[image]

Term
phenotype
Definition
physical traits; purple and white
Term
genotype
Definition
genetic makeup
Term
test cross
Definition
breeding of recessive homozygote with an organism of dominant phenotype but unknown genotype
Term
monohybrid
Definition
heterozygous for one character
Term
dihybrids
Definition

heterozygous for both characters

(YyRr)

 

Term
Law of Independent Assortment
Definition
each pair of alleles segregates of other pairs of alleles during gamete formation
Term
Complete Dominance
Definition

one allele dominates the other

 

Term
Codominance
Definition
two alleles both affect the phenotype in separate, distinguishable ways
Term
incomplete dominance
Definition

ex. red flowers are crossed with white flowers and make pink flowers

[image]

Term
epistasis
Definition

a gene @ one locus alters the phenotypic expression of a gene at a second locus

[image]

Term
pleiotropy
Definition
gene which has multiple phenotypic effects
Term
quantitative characters
Definition

characters that can not be classified on an either-or basis. 

ex. SKIN PIGMENT

Term
Polygenic Inheritance
Definition
additive effect of two or more genes on a single phenotypic character
Term
pedigree
Definition

information about family's history for a particular trait 

[image]

Term
amniocentesis
Definition

determines whether a developing fetus has Tay-Sachs disease

[image]

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