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Inheritance terms

DHS N5 Inheritance and variation terms and definitions

TermDefinition
Discrete Variation Differences between members of the same species which allows them to be put into seperate, distinct groups.
Continuous Variation Differences between members of the same species which have a range of values between two extremes.
Gene A small area of a chromosome which contains the instructions to make the proteins needed to control a particular characteristic.
Homozygous A genotype which contains 2 identical alleles.
Heterozygous A genotype which contains 2 different alleles.
Alleles The different forms of a gene for a particular characteristic; which cause the variations seen in a single characteristic.
Phenotype The physical characteristics displayed by an organism.
Genotype The alleles present within an individual for a particular characteristic.
Dominant Characteristic A characteristic which can cover the effect of another characteristic.
Recessive Characteristic A characteristic whose effect has been covered by a dominant characteristic
Family Tree A diagram which shows the expression and passage of a characteristic through a number of generations of the same family
Genetic Counselling The process by which people at risk of an inherited disorder are advised of the consequences and nature of the disorder, the probability of developing or passing it on.
Polygenic Inheritance Characteristics which are controlled by 2 or more different genes.
Created by: dhsbiology