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Browse the glossary using this index

Especial | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Tot

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D

DNA


1) deoxyribonucleic acid - A double helic, containing ....

2) A long linear polymer found in the nucleus of a cell and formed from nucleotides and shaped like a double helix; associated with the transmission of genetic information

A

allele

1) One of a number of alternative forms of a gene. Commonly only two alternative forms exist for a gene.
(Adapted from Edexcel GCSE SCience and Data Resource Book, UG005206) 

2) Either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character

antibody

 1 Any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response

asexual reproduction

1 Reproduction without the fusion of gametes

C

cancer


1 Any malignant growth or tumour caused by abnormal and uncontrolled cell division; it may spread to other parts of the body through the lymphatic system or the blood stream

cell


1) The basic structural and functional unit of all organisms; they may exist as independent units of life (as in monads) or may form colonies or tissues as in higher plants and animals

characteristic


1) A distinguishing quality

chromosome

1) A thread-like structure, made of protein, containing a number of genes aligned along its length.
 (Adapted from Edexcel GCSE SCience and Data Resource Book, UG005206) 


2) A threadlike body in the cell nucleus that carries the genes in a linear order

clone

1) An identical individual (oxy-moron)


2) A group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction

cystic fibrosis


1) The most common congenital disease; the child's lungs and intestines and pancreas become clogged with thick mucus; caused by defect in a single gene; there is no cure

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