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Cell Division

The process by which a cell divides into two new daughter cells


One of two identical sister parts of a duplicated chromosome


Area where chromatids of a chromosome are attached


Period of the cell cycle between cell divisions

Cell Cycle

Series of events that cells go through as they grow and divide


Part of the eukaryotic cell division during which the cell nucleus divides


During this phase the chromatin condenses into chromosomes; the centrioles and a spindle begin to form; the nuclear membrane breaks down


During this phase the chromosomes line up across the center of the cell and each chromosome is connected to a spindle fiber at its centromere


During this phase the sister chromatids separate into individual chromosomes and are moved apart


During this phase the chromosomes gather at opposite ends of the cell and lose their distinct shape; two nuclear membranes form


One of a family of closely related proteins that regulate the cell cycle in eukaryotic cells

Independent Assortment

Independent segregation of alleles during the formation of gametes

Incomplete dominance

Situation when one allele is not completely dominant over the other


When both alleles for a trait contribute to the phenotype of an organism


When a cell has both sets of homologous chromosomes


When a sell contains only one set of chromosomes and only a single set of genes


Structure that contains 4 chromatids that forms during meiosis


Region of chromosome in an operon to which the repressor binds when the operon is "turned off"


A group of genes working together

RNA Polymerase

Enzyme that binds to DNA and separates the DNA strands during transcription


Region of DNA that indicates to an enzyme where to bind to make RNA


Sequence of DNA that is not involved in coding for a protein


Expressed sequence of DNA; codes for a protein


Three-nucleotide sequence of mRNA that codes for a single amino acid


Group of three bases on a tRNA molecule that are complementary to an mRNA codon

DNA Polymerase

Enzyme involved in DNA replication that joins individual nucleotides to produce a DNA molecule


Error in meiosis in which homologous chromosomes fail to separate

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