B1.2.8 understand that an allele can be B1.2.2 explain single gene inheritance, including dominant or recessive, and that: B1.2.4 dominant and recessive alleles and use a. an individual with one or both B1.2.5 of genetic diagrams dominant alleles (in a pair of B1.2.6 use direct proportions and simple ratios alleles) will show the associated in genetic crosses dominant characteristic b. an use the concept of probability in individual with one recessive predicting the outcome of genetic crosses allele (in a pair of alleles) will not recall that most phenotypic features are show the associated recessive the result of multiple genes rather than characteristic c. an individual single gene inheritance with both recessive alleles (in a pair of alleles) will show the associated recessive characteristic B1.2.9 recall that human males have B1.2.8 describe sex determination in humans XY sex chromosomes and females have XX sex chromosomes B1.2.10 understand that the B1.2.8 describe sex determination in humans gene on the Y chromosome triggers the development of testes, and that in the absence of a Y chromosome ovaries develop B1.2.11 use and interpret genetic B1.2.2 explain single gene inheritance, including diagrams (family trees and dominant and recessive alleles and use Punnett squares) showing: a. of genetic diagrams the inheritance of single gene characteristics with a dominant and recessive allele b. the inheritance of sex chromosomes B1.2.12 understand that the term B1.1.5 explain the terms chromosome, gene, genotype describes the genetic allele, variant, genotype and phenotype make-up of an organism (the combination of alleles), and the term phenotype describes the observable characteristics that the organism has B1.3.1 understand that a small number B1.3.1 discuss the potential importance for of disorders are caused by faulty medicine of our increasing understanding alleles of a single gene, of the human genome, including the including Huntington’s disease discovery of alleles associated with and cystic fibrosis diseases and the genetic testing of individuals to inform family planning and healthcare B1.3.2 recall that disorders may be NA NA caused by dominant alleles (e.g. Huntington’s disease) or  recessive alleles (e.g. cystic fibrosis)
B1.2.8 understand that an allele can be dominant or recessive, and that: a. an individual with one or both dominant alleles (in a pair of alleles) will show the associated dominant characteristic b. an individual with one recessive allele (in a pair of alleles) will not show the associated recessive characteristic c. an individual with both recessive alleles (in a pair of alleles) will show the associated recessive characteristic B1.2.2 B1.2.4 B1.2.5 B1.2.6 explain single gene inheritance, including dominant and recessive alleles and use of genetic diagrams use direct proportions and simple ratios in genetic crosses use the concept of probability in predicting the outcome of genetic crosses recall that most phenotypic features are the result of multiple genes rather than single gene inheritance B1.2.9 recall that human males have XY sex chromosomes and females have XX sex chromosomes B1.2.8 describe sex determination in humans B1.2.10 understand that the gene on the Y chromosome triggers the development of testes, and that in the absence of a Y chromosome ovaries develop B1.2.8 describe sex determination in humans B1.2.11 use and interpret genetic diagrams (family trees and Punnett squares) showing: a. the inheritance of single gene characteristics with a dominant and recessive allele b. the inheritance of sex chromosomes B1.2.2 explain single gene inheritance, including dominant and recessive alleles and use of genetic diagrams B1.2.12 understand that the term genotype describes the genetic make-up of an organism (the combination of alleles), and the term phenotype describes the observable characteristics that the organism has B1.1.5 explain the terms chromosome, gene, allele, variant, genotype and phenotype B1.3.1 understand that a small number of disorders are caused by faulty alleles of a single gene, including Huntington’s disease and cystic fibrosis B1.3.1 discuss the potential importance for medicine of our increasing understanding of the human genome, including the discovery of alleles associated with diseases and the genetic testing of individuals to inform family planning and healthcare B1.3.2 recall that disorders may be caused by dominant alleles (e.g. Huntington’s disease) or recessive alleles (e.g. cystic fibrosis) NA NA 
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