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Vocabulary List #3
Pages 173-178
19
Biology
10th Grade
10/04/2010

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Term
Allele
Definition
One of the alternative forms of a gene that governs a characteristic, such as hair color.
Term
Cross-pollination 
Definition
A reproductive process in which pollen from one plant is transferred to the stigma of another plant.
Term
Dihybrid cross
Definition
A cross between individuals that have different alleles for the same gene.
Term
F1 Generation
Definition
The first generation of offspring obtained from an experimental cross of two organisms.
Term
F2 Generation
Definition
The second generation of offspring, obtained from an experimental cross of two organisms;the offspring of the F1 generation.
Term
Genotype
Definition
The entire genetic makeup of an organism; also the combination of genes for one of more specific traits.
Term
Heredity
Definition
The passing of genetic traits from parent to offspring.
Term
Heterozygous
Definition
Describes an individual that has two different alleles for a trait. 
Term
Homozygous
Definition
Describes an individual that has identical alleles for a trait on both homologous chromosomes.
Term
Monohybrid cross
Definition
A cross between individuals that involves one pair of contrasting traits.
Term
P-Generation
Definition
Two unlike individuals that begin a genetics experiment, or breeding program.
Term
Phenotype
Definition
An organism's appearance or other detectable characteristic that results from the organism's genotype and the environment.  
Term
Probability
Definition
The likelihood that a possible future even will occur in any given instance of the event; the mathematical ratio of the number of times one outcome of any event is likely to occur to the number of possible outcomes of the event.
Term
Punnett Square 
Definition
A graphic used to predict the results of a genetic cross.
Term
Recessive Gene
Definition
A gene that affects an animal's appearance if it's present in the homozygous state. A heterozygous animal carrying a mutated, recessive gene looks normal.
Term
Segregation
Definition
Mendel's first law; The separation of the members of a pair of chromosomes into different gametes through the process of meiosis.
Term
Self-pollination
Definition
The transfer of pollen grains from an anther to the stigma of the same flower or to the stigma of another flower on the same plant.
Term
Trait
Definition
A genetically determined variant of a characteristic. 
Term
True-breeding
Definition
Describes organisms or genotypes that are homozygous for a specific trait and thus always produce offspring that have the same phenotype for that trait.
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