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Unit One Terms
Chapter 1,2,3,4 & 6 Terms
24
Biology
Undergraduate 3
09/03/2011

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Term
Genome
Definition
The entire complement of genetic material of an organism.
Term
Chromosome
Definition
Discrete piece of DNA, containg genes
-Linear or Circular
Term
Chromosome Number (n)
Definition
The number of unique chromosomes within the cell of an organism
Term
Haploid
Definition
(n), 1 copy of each chromosome per cell
Term
Diploid
Definition
(2n), 2 copies of each chromosome per cell
Term
Polyploid
Definition
(3n, 4n,..) multiple copies of each chromosome per cell
Term
Homologs/Homologous Chromosome
Definition
Virtually identical chromosome pairs.
-Same genes, but with different variations of the gene
Term
Gene
Definition
Functional segment of DNA composed of a transcribed region and a regulator sequence that makes transcription possible.
Term
Chromatin
Definition
Nucleo-protein complex
-Histones
Term
Histone
Definition
A protein that coils DNA to form nucleosomes.
Term
Mitosis
Definition
Somatic cell division, results in two identical daughter cells
Term
Meiosis
Definition
Sexual reproduction, results in 4 daughters cells each containing half the genetic content of the mother cell
Term
Chromatid
Definition
One of the two replicated halves of a chromosome
Term
Phenotype
Definition
The observable attributes of an organism.
Term
Genotype
Definition
The genetic makeup of the organism.
Term
Mendel's First Law
Definition
In meiosis, the members of a gene pair separate equally into egg and sperm.
Term
Allele
Definition
One particular form of a gene
Term
Homozygous
Definition
Pair of identical alleles
Term
Heterozygous
Definition
Pair of different alleles
Term
Hemizygous
Definition
Gene which is present on only one copy of homolog
Term
Mendel's Second Law
Definition
Gene pairs on different chromosome pairs assort independently at meiosis
Term
Recombination
Definition
Production of new allele combination
Term
Linked Genes
Definition
Genes located on the same chromosome
Term
Dyad
Definition
Two sister chromatids attached to the same centromere.
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