Eukaryotic Cells: Structure Cells can be divided into two broad types;?eukaryotic?and?prokaryotic?cells Eukaryotic cells have a?more complex ultrastructure?than prokaryotic cells The term ultrastru...
Cell Theory Until microscopes became powerful enough to view individual cells, no-one knew for certain what living organisms were made from A scientist called?Robert Hooke?is thought to be the?firs...
Genetic Screening: Uses Some circumstances, e.g. in a pregnancy where there is a family history of a genetic disorder, may require individuals to determine if they have a particular allele present ...
Chi-squared Test The?difference between expected and observed results?in experiments can be statistically significant or insignificant (happened by chance) If the difference between results is stat...
Monohybrid Crosses Monohybrid inheritance looks at how the?alleles for a single gene are passed on from one generation to the next Known information about the?genotypes,?phenotypes?and the process ...
Pedigree Diagrams Family pedigree diagrams can be used to trace the?pattern of inheritance?of a specific trait, e.g. a genetic disorder,?through generations of a family Pedigree diagrams can provid...
Inheritance: Key Terms Genes & alleles A?chromosome?is a long DNA molecule which contains?genes?that?code for several different proteins A?gene?is a length of DNA that codes for a single?polype...
Mutations A?gene mutation?is a change in the sequence of base pairs in a DNA molecule that may result in an altered polypeptide Mutations occur?continuously?and?spontaneously Errors in the DNA ofte...
DNA Replication Before?a (parent) cell?divides, it needs to?copy the DNA?contained within it Doubling the DNA?ensures that the two new (daughter) cells produced will both receive?full copies of the...
