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Genetics
Study of Heredity
16
Biology
9th Grade
04/16/2013

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Term
Gene
Definition
A gene is a functional unit on DNA. A gene codes for a protein.
Term
Chromosome
Definition
A threadlike strand of DNA in the cell nucleus that carries the genes in a linear order.
It is a structure that DNA wraps around.
Term
Allele
Definition
is one member of a pair or series of different forms of a gene. They differ mainly in there peptide chain sequences.
Term
Genotype
Definition
In gentics the genotype is the actual genetic make-up of a trait, as opposed to the physically expressed trait (phenotype).
Term
Phenotype
Definition
The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.
Term
Gamete
Definition
A reproductive cell having the haploid number of chromosomes, especially a mature sperm or egg capable of fusing with a gamete of the opposite sex to produce the fertilized egg.
Term
Punnett Square
Definition
is a diagram that is used to predict an outcome of a particular cross or breeding experiment.
Term
    Random Segregation
Definition
When homologous chromosomes enter different gametes, there is no way of telling which chromosome (and, therefore, which genes) will end up in which gamete.
Term
        Crossing Over
Definition
A process occurring during meiosis wherein two chromosomes pair up and exchange segments of their genetic material.
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
is a two-part cell division process in organisms that sexually reproduce.
Term
    Fertilization
Definition
is the process in which an egg and a sperm cell come together to form a zygote, beginning the series of events that can result in pregnancy.
Term
    Zygote
Definition
is the initial cell formed when two gamete cells are joined by means of sexual reproduction.
Term
Dominant
Definition
trait is a genetic trait that manifests when only one copy of the gene is present.
Term
    Recessive
Definition
trait is one caused by a recessive gene
Term
    Homozygous
Definition
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