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genetics
1-20
21
Biology
9th Grade
03/10/2008

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Term

trait

Definition
is a varation of particular character. .
Term
 genetics
Definition
the study of heredity
Term
monohybrid cross
Definition
a pairing in which the parent plants diffrent in only one charcter.
Term
cross-fertlization
Definition
sperm from the pollen of one flower fertlizes the egg in the flower of a diffrent plant.
Term
hybrid
Definition
the offspring of two diffrent the breeding varieties 
Term
allele
Definition
these alternative form of gene are called alleles.
Term
homozygous
Definition
the same the indiivauls.
Term
heterozygous
Definition
if the two alleles are different
Term
dominat
Definition
when only one of the two diffrent alleles in a heterzygous individual appers to affect the trait, 
Term
recessive
Definition
 an allele in a herterozygous 1 that does not affect a trait.
Term
genotype
Definition
the gentic makeup or combination of alleles   
Term
testcross.
Definition
breeds on 1 of unknown genetype,but domaint penetype with a homozygous recessive 1 .mating of an 1 of unknown genotype but domaint phenetype with a homozygous recessive 1.
Term
 dihybrid cross
Definition
mating of two organism that diffrer in two charcters.
Term
intermediate inhertiance.
Definition

in which hertezygous have a phenetype

interedite between the phenetype of the two homozygous.

Term
codominance
Definition
inhertiance pattern in which a herteozygous express the distinct traits of both allels
Term
polygenic inheritance
Definition
combained effect of two or more genes on a single charcter.
Term
chromsome theory of inheritance
Definition
generalzation that genes are located on chromsome and that the behavoir of chromsomes during meiosis and felization accounts for inhertainace patterns. 
Term
gene locus
Definition
specific location of a gene on a pulation.
Term
gene linkage
Definition
tendency for alles of gene on the same chromsones to be inhertied togeather.
Term
sex-linked gene
Definition
gene located on a sex chromsome.
Term
phenetype
Definition

physical traits

and observable trait

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