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Genetics Glossary

Glossary of commonly used genetics terms.

Allele - A Genetics Definition
Definition of allele.

Chromatin
Chromatin is a mass of genetic material composed of DNA and proteins that condense to form chromosomes.

Chromosome
A chromosome is a long, stringy aggregate of genes that carries heredity information and is formed from condensed chromatin.

Dihybrid Cross - A Genetics Definition
Definition of the term dihybrid cross.

Diploid Cell
A diploid cell is a cell that contains two sets of chromosomes.

DNA
DNA is a type of nucleic acid that contains the genetic information necessary for the production of other cell components and for the reproduction of life.

Gametes
Gametes are reproductive cells. These cells unite to form a new cell called a zygote.

Gene Theory
The Gene Theory is one of the basic principles of biology. The main concept of this theory is that traits are passed from parents to offspring through gene transmission.

Genetics Glossary
This genetics glossary is a good resource for finding succinct, practical, and meaningful biology definitions for various genetics terms.

Haploid Cell
A haploid cell is a cell that contains one complete set of chromosomes.

Heterozygous - A Genetics Definition
Definition of the word heterozygous.

Homologous Chromosomes - A Genetics Definition
Definition of the term homologous chromosomes.

Homozygous - A Genetics Definition
Definition of the word homozygous.

Incomplete Dominance - A Genetics Definition
Definition of the term incomplete dominance.

Mendel's Law of Segregation
Mendel's Law of Segregation states that allele pairs separate during gamete formation, and randomly unite at fertilization.

Monohybrid Cross - A Genetics Definition
Definition of the term monohybrid cross.

Genetic Variation
In genetic variation, the alleles of organisms within a population change.

Endoreduplication
Endoreduplication is a process whereby cells grow and enlarge, but do not go through the process of dividing called mitosis.

Genes
Genes are segments of DNA located on chromosomes. Genes contain the codes for the production of specific proteins.

Nucleus
The nucleus is a cell structure that contains hereditary information, or DNA, and controls cellular growth and reproduction.

Parthenogenesis
Parthenogenesis is type of asexual reproduction in which a female a female gamete or egg cell develops into an individual without fertilization.

Mendel's Law of Independent Assortment
Mendel's law of independent assortment states that allele pairs separate independently during the formation of gametes.

True-breeding Plant
A true-breeding plant is one that, when self-fertilized, only produces offspring with the same traits.

Phenotype
Phenotype is defined as an organism's expressed physical traits. It is determined by an individual's genotype and expressed genes, random genetic variation, and environmental influences.

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