IGCSE Biology - Variation and Inheritance
Key terms from Edexcel IGCSE Biology on the topic of Variation and Inheritance
Supercolied thread of DNA.
Short section of DNA that codes for a protein.
Three examples of human proteins
Haemoglobin, Amylase, and Lipase.
An alternative form of a gene
Two identical alleles of a gene (TT,tt).
Two different alleles of a gene (Tt, tT).
always expressed in the phenotype (whenever present) e.g. Ff or FF
only expressed in the phenotype if the dominant allele is absent e.g. ff
the alleles present in the nuclei of an organism.
the physical or chemical expression of the genotype
The shape of DNA.
Sex cells e.g. sperm or egg.
A fertilised egg cell.
Where the DNA is located in a cell.
A person with this genotype would have cystic fibrosis
A person with either of these genotypes would not have CF
Ff or FF
A person with this genotype would be described as a carrier for cystic fibrosis
the alleles of a particular gene are different e.g. Ff.
A person with either of these genotypes would have polydactyly
Dd or DD
A person with this genotype would not have polydactyly
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