B1H GLOSSARY

ALL THE WORDS YOU NEED TO KNOW FOR B1H SINGLE SCIENCE, OCR BOARD - HIGHER TIER, BIOLOGY

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B1h
Allele ­ A genetic instruction received from one parent ; alleles
from both parents from a gene
Dominant ­ an allele that always expresses itself
Heterozygous ­ a gene that consists of two different alleles
Homozygous ­ a gene that consist of two identical alleles
Mutation ­ a change to the structure of a gene or DNA caused
by such things as chemicals, X ­ rays or radiation
Recessive ­ an allele that only expresses itself if the dominant
allele is not present

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