Gene Control: Transcription Factors Prokaryotes use?operons?to control the expression of genes in cells Eukaryotes also use?transcription factors?to control gene expression A transcription factor i...
Gene Control: Lac Operon Regulatory genes?control?structural genes?and their levels of protein production Regulatory genes sometimes have control over several structural genes at once Structural ge...
Gene Control The nucleus of every cell in the human body contains the same genes However?not every gene is expressed?in every cell Not all of these genes are expressed all the time There are severa...
The Role of Gibberellin in Stem Elongation In some plants species their height is partially controlled by their genes The?Le?gene?dictates the height of some plants It has two alleles:?Le?and?le Th...
Genes, Proteins & Phenotype A gene can affect a?phenotype?of an organism A gene codes for a single protein The protein affects the phenotype through a particular mechanism The phenotype of an i...
Predicting Inheritance: Chi-squared Test The?difference between expected and observed results?in experiments can be statistically significant or insignificant (happened by chance) If the difference...
Predicting Inheritance: Test Crosses A test cross can be used to?deduce the?genotype?of an unknown individual that is expressing a dominant?phenotype The individual in question is crossed with an i...
Predicting Inheritance: Dihybrid Crosses Monohybrid crosses look at how the alleles of one gene transfer across generations Dihybrid crosses look at how the alleles of?two genes?transfer across gen...
Predicting Inheritance: 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, phe...
Key Terms in Genetics Genes & alleles The DNA contained within chromosomes is essential for cell survival Every?chromosome?consists of a long DNA molecule which?codes for several different prot...
Meiosis: Sources of Genetic Variation Having?genetically different offspring?can be?advantageous?for natural selection Meiosis?has several mechanisms that?increase the genetic diversity of gametes?...
Identifying the Stages of Meiosis Cells undergoing?meiosis?can be observed and photographed using specialised microscopes The different stages of meiosis have distinctive characteristics meaning th...
