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Summary Inheritance A level Biology AQA
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Year 1 Biology AQA A level notes. Achieved an A* in my final exam using these notes. They are based on the mark scheme requirements.
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Inheritance summary notes08 February 2023 14:58
Definitions:
• Haploid = 1 copy of chromosomes (half the number that are in a diploid cell)
• Diploid = 2 copies of each chromosome
• Genotype = genetic constitution of an organism - the alleles an organism has
• Phenotype = the expression of the genotype and its interaction with the environment
• Allele = variations of the same gene (due to differences in base sequences)
• Gene = a section of DNA on a chromosome that codes for a polypeptide, tRNA or rRNA
• Locus = the position on a chromosome where a particular gene is found
• Homologous chromosomes = chromosomes in a pair, one parental and one maternal,
with same genes at same loci but could have different alleles
• Homozygous = alleles of a particular gene are identical
• Heterozygous = alleles of particular gene are different
• Dominant Allele = allele that is always expressed in the phenotype even if only one is
present
• Recessive Allele = effect of the allele is only apparent in the phenotype in the presenc
another recessive allele
• Codominant alleles = condition in which both alleles for one gene in a heterozygous
organism contribute to the phenotype
Pure-breeding- breeding repeatedly with each other so that one characteristic is bred
Basic law of genetics- in diploid organisms, characteristics are determined by alleles that occ
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