Genetic inheritance 4.6.1.4 Give examples of 2 Discuss variation in families and Inherited characteristics controlled by and why offspring have some 4.6.1.5 disorders a single gene and describe characteristics of their mother their alleles. and some of their father and Some often strongly resemble their characteristics are grandparents. controlled by a single gene. Each gene may have different forms called alleles. Complete Punnett squares. The genes present, 4.6.1.4 Complete Punnett squares Give examples of or genotype, BBC activity Inheritance and genetic crosses. characteristics controlled by operate at a 4.6.1.5 showing genetic crosses (see Interpret the results and multiple genes. molecular level to resources). describe the offspring. develop Define and use the characteristics that gametes, genotype, are expressed as a phenotype, dominant Show images of polydactyly. phenotype. recessive, homozygous and Interpret family trees to heterozygous. determine chance of inheriting A dominant allele is disorders. Complete a Punnett square expressed if only to show the outcomes of present on one Watch a video to explain what genetic crosses. chromosome. cystic fibrosis is, how it is Interpret the results of a inherited and to illustrate the A recessive allele is genetic cross diagram and severity of the disorder (see only expressed if use direct proportion and resources). present on both Video clip: simple ratios to express the chromosomes. outcomes. Describe the
4.6.1.4 4.6.1.5 4.6.1.4 4.6.1.5 Genetic inheritance and Inherited disorders Some characteristics are controlled by a single gene. Each gene may have different forms called alleles. The genes present, or genotype, operate at a molecular level to develop characteristics that are expressed as a phenotype. A dominant allele is expressed if only present on one chromosome. A recessive allele is only expressed if present on both chromosomes. Give examples of characteristics controlled by a single gene and describe their alleles. Give examples of characteristics controlled by multiple genes. Define and use the gametes, genotype, phenotype, dominant recessive, homozygous and heterozygous. Complete a Punnett square to show the outcomes of genetic crosses. Interpret the results of a genetic cross diagram and use direct proportion and simple ratios to express the outcomes. Describe the 2 Discuss variation in families and why offspring have some characteristics of their mother and some of their father and often strongly resemble their grandparents. Complete Punnett squares. BBC activity Inheritance showing genetic crosses (see resources). Show images of polydactyly. Interpret family trees to determine chance of inheriting disorders. Watch a video to explain what cystic fibrosis is, how it is inherited and to illustrate the severity of the disorder (see resources). Complete Punnett squares and genetic crosses. Interpret the results and describe the offspring. Video clip: