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Modern Biology
na
29
Biology
9th Grade
11/19/2012

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Term
heredity
Definition
the passing of traits from parents to offspring
Term
Cross pollination
Definition
a reproductive process in which pollen from one plant is transferred to the stigma of another plant
Term
Recessive
Definition
describes a trait or allele that is expressed only when 2 recessive alleles for the same characteristic are inherited
Term
Allele
Definition
one of the alternative forms of a gene that governs a characteristic such as hair color
Term
F2 generation
Definition
the second generation of offspringand offspring of f1 generation
Term
true breeding
Definition
organisms or genotypes that are homozygous for a specific trait and always produce offspring that have the same trait
Term
P generation
Definition
parental generation: the first 2 individuals that mate in a genetic cross
Term
pollination
Definition
the transfer of pollen from the male reproductive parts to the female structure of a plant
Term
traits
Definition
a genetically determined characteristic
Term
molecular science
Definition
the study of the structure of nucleic acids and functions of genes
Term
genetics
Definition
the science of heredity and the mechanisms by which traits are passed from parent to offspring
Term
cross Pollination
Definition
the transfer of pollen grains from the anther to the stigma of the same flower or the stigma of another flower on the same plant
Term
law of segregation
Definition
states that pairs of homologous chromosomes seperate in meiosis so that only one chromosome from each pair is present in each gamete
Term
dominant
Definition
describes the allele that is fully expresses when carried only one of the pair of homologous chromosomes
Term
f1 generation
Definition
the first generation of offspring obtainded from an experimental cross of 2 organisms
Term
genotypic ratio
Definition
the ratio of the gnotypes that appear in the offspring
Term
homozygous
Definition
describes the individual that has identical alleles for a trait on both homologous chromosomes
Term
heterozygous
Definition
describes an individual that has 2 different alleles for a trait
Term
monohybrid cross
Definition
a cross between individuals that involves one pair of contrasting traits
Term
testcross
Definition
that crossing of an individual or unknown genotype with a homozygous recessive individual to determine the unknown genotype
Term
genotype
Definition
the entire geetic makeup of an organsism
Term
punnet square
Definition
a grapgic used to predict the results of a genetic cross
Term
dyhybrid cross
Definition
a cross between individal that have different alleles for the same gene
Term
phenotypic ratio
Definition
that ratio of phenotypes produced by a cross
Term
incomplate dominance
Definition
a condition in which the dominant allele is unable to express itself fully
Term
complete dominance
Definition
a relationship in which one allele is completely dominant over the other
Term
probability
Definition
the likelihood that a possible future event will occur in any given instance
Term
codominance
Definition
a condition in which both alleles for a gene are fully expressed
Term
phenotype
Definition
an organsisms appearence or other detectable characteristic that results from the organisms genotype and the enviroment
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