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Vocabulary Words
Genetics
22
Biology
9th Grade
04/22/2013

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Term
Gene
Definition
Hereditary information held in the DNA of cells.
Term
Chromosome
Definition
A structure in cells composed of DNA and proteins that contain the genetic information of the cell.
Term
Allele
Definition
Alternative form of a gene.
Term
Genotype
Definition
The genetic makeup of an organism.
Term
Phenotype
Definition
An organisms expressed physical traits
Term
Gamete
Definition
Haploid reproductive cells that unite during sexual reproduction to form a diploid zygote. Male gametes are sperm and female gametes are eggs.
Term
Punnett Square
Definition
A tool that helps to show all possible allelic combinations of gametes in a cross of parents with known genotypes in order to predict the probability of their offspring possessing certain sets of alleles.
Term
Random Segregation
Definition
The separation of allelic genes into different gametes during meiosis.
Term
Crossing Over
Definition
The interchange of corresponding chromatid segments of homologous chromosomes with their linked genes.
Term
Independent Assortment
Definition
The process of random segregation and assortment of chromosomes during anaphase I of meiosis resulting in the production of genetically unique gametes
Term
Meiosis
Definition
Genetics The process of cell division in sexually reproducing organisms that reduces the number of chromosomes in reproductive cells from diploid to haploid, leading to the production of gametes in animals and spores in plants.
Term
Fertilization
Definition
The union of male and female gametes to form a zygote.
Term
Zygote
Definition
The cell formed by the union of two gametes, especially a fertilized ovum before cleavage. The organism that develops from a zygote.
Term
Dominant
Definition
A dominant allele or trait.
Term
Recessive
Definition
Trait or character determined by such allele.
Term
Homozygous
Definition
having identical pairs of genes for any given pair of hereditary characteristics.
Term
Heterozygous
Definition
having dissimilar pairs of genes for any hereditary characteristic.
Term
Autosomal Inheritance
Definition
Phenotypical characteristics that are inherited via the autosomes from parents regardless of parents sex.
Term
X-Linked Inheritance
Definition
Male chromosome.
Term
Complete Dominance
Definition
If two alleles have a complete dominance relationship, the phenotype of the heterozygote will be indistinguishable from the phenotype of the homozygous dominant.
Term
Codominance
Definition
A condition in which the alleles of a gene pair in a heterozygote are fully expressed thereby resulting in offspring with a phenotype that is neither dominant nor recessive.
Term
Incomplete Dominance
Definition
A kind of dominance occurring in heterozygotes in which the dominant allele is only partially expressed, and usually resulting in an offspring with an intermediate phenotype.
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