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Browse the glossary using this index

Special | 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 | ALL

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D

dominant


1) An allele which is always expressed in an individual.
(Adapted from Edexcel GCSE SCience and Data Resource Book, UG005206)


2) An allele that produces the same phenotype whether its paired allele is identical or different

E

environment


1) The area in which something exists or lives

F

fertilisation


1)The fusion of male and female gametes nucleus to form a zygote; of sperm and ova in an animal or pollen and ovule in a plant

forensic

????

G

gene


1) A length of DNA which codes for the production of one protein
(Adapted from Edexcel GCSE SCience and Data Resource Book, UG005206)


2)A segment of DNA that is involved in producing a polypeptide chain; it can include regions preceding and following the codingDNA aswell as introns between the exons; it is considered a unit of heredity

generation


1) Group of genetically related organisms constituting a single stepin the lineofdescent

2) The act of producing offspring or multiplying by such production

3) All the people living at the same time or of approximately the same age

genetics


1) The branch of biology that studies heredity and variation in organisms

genotype


1) The alleles present in the genetic make up of an individual. e.g. the genotype of a human male is XY (the X and Y are alleles).
(Adapted from Edexcel GCSE SCience and Data Resource Book, UG005206)

H

heterozygous


1) An individual who inherits two alternative alleles for a feature. e.g. Tt, XY
(adapted from Edexcel GCSE SCience and Data Resource Book, UG005206)

homozygous



1) An individual who inherits identical alleles for a feature from the parent e.g. TT, tt or XX
(adapted from Edexcel GCSE SCience and Data Resource Book, UG005206)

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