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Genes, inheritance and selection
Revision and exam practice for Genes, inheritance and selection.
19
Objectives
10
Flashcards
10
Questions
90 min
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OcrGcseBiology A GatewayGenes, inheritance and selection
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19 objective pages available
Understanding Key Genetic Terms1 objectives
- Account for the following terms: gamete, chromosome, gene, allele/variant, dominant, recessive, homozygous, heterozygous, genotype and phenotype.
Understanding the Genome1 objectives
- Communicate the key features of the genome as the entire genetic material of an organism.
Genome, Environment, and Phenotype Development1 objectives
- Communicate the key features of the genome, and its interaction with the environment, influence the development of the phenotype of an organism.
Understanding Mutations and Their Impact on Phenotype1 objectives
- Retrieve and apply knowledge of all variants arise from mutations, and that most have no effect on the phenotype, some influence phenotype and a very few determine phenotype.
Genetic Variants and Their Influence on Phenotype (Higher)1 objectives
- Communicate the key features of the way genetic variants may influence phenotype: • in coding DNA by altering the activity of a protein • in non-coding DNA by altering how genes are expressed.
Asexual and Sexual Reproduction: Advantages and Disadvantages1 objectives
- Account for some of the advantages and disadvantages of asexual and sexual reproduction in a range of organisms.
Haploid and Diploid Cells Explained1 objectives
- Account for the terms haploid and diploid.
The Role of Meiosis in Gamete Formation1 objectives
- Account for the role of meiotic cell division in halving the chromosome number to form gametes.
Understanding Single Gene Inheritance1 objectives
- Account for single gene inheritance.
Predicting Results of Single Gene Crosses1 objectives
- Use evidence to predict the results of single gene crosses.
Sex Determination in Humans and Genetic Crosses1 objectives
- Communicate the key features of sex determination in humans using a genetic cross.
Complex Inheritance: Multiple Genes and Phenotypic Features1 objectives
- Retrieve and apply knowledge of most phenotypic features are the result of multiple genes rather than single gene inheritance.
Development of Understanding in Genetics1 objectives
- Communicate the key features of the development of our understanding of genetics.
Genetic Variation within a Species1 objectives
- Develop knowledge and skill in there is usually extensive genetic variation within a population of a species.
Impact of Developments in Biology on Classification Systems1 objectives
- Communicate the key features of the impact of developments in biology on classification systems.
Evolution Through Natural Selection1 objectives
- Account for the way evolution occurs through the natural selection of variants that have given rise to phenotypes best suited to their environment.
Understanding Evolution and Natural Selection1 objectives
- Communicate the key features of evolution as a change in the inherited characteristics of a population over time, through a process of natural selection, which may result in the formation of new species.
Evidence for Evolution1 objectives
- Communicate the key features of the evidence for evolution.
Development of the Theory of Evolution by Natural Selection1 objectives
- Communicate the key features of the work of Darwin and Wallace in the development of the theory of evolution by natural selection and explain the impact of these ideas on modern biology.
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Practice preview
- Consider a condition where individuals with a specific genetic variant produce significantly less of a crucial enzyme. This variant is found within a region of DNA that does not directly specify amino acids. This indicates the variant influences phenotype by: (Higher)
- In genetics, what is the term for a trait that is only expressed when two copies of its allele are present?
- Describe the process by which meiotic cell division reduces the chromosome number, and explain why this reduction is essential for sexual reproduction. [4 marks]
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