IB DP Biology: HL复习笔记11.1.5 Zoonosis
Zoonosis Some diseases are species specific whilst others can cross species barriers to infect multiple different species Species-specific disease may be unable to cross the species barrier for man...
IB DP Biology: HL复习笔记11.1.4 Smallpox Vaccine & Eradication
Jenner's Ethics Introduction The principles underpinning vaccinations were discovered by Edward Jenner in the 1700s when he developed the first smallpox vaccine Smallpox was a highly infectious dis...
IB DP Biology: HL复习笔记11.1.3 Antibodies, Vaccines & Immunity
Antibodies: Function The function of antibodies produced by B-cells is to destroy pathogens within the body This can be done either directly, or by recruiting other immune cells Antibodies aid the ...
IB DP Biology: HL复习笔记11.1.2 Specific Immune Response
Specific Immune Response T-Helper cells (a type of lymphocyte that responds to specific antigens) and mature B cells (another type of lymphocyte) have specific receptors located on their cell surfa...
IB DP Biology: HL复习笔记11.1.1 Antigens
Antigens Every organism has cells with unique molecules on the cell surface membrane which act as markers to identify it These unique markers are macromolecules and they allow cell-to-cell recognit...
IB DP Biology: HL复习笔记10.3.5 Skills: Comparing Allele Frequencies Between Populations
Populations & their Allele Frequencies Comparison of allele frequencies of geographically isolated populations Allele frequency is a term that assigns a relative frequency of an allele at a par...
IB DP Biology: HL复习笔记10.3.4 Polyploidy & Speciation
Polyploidy & Speciation NOS: Looking for patterns, trends and discrepancies—patterns of chromosome number in some genera can be explained by speciation due to polyploidy When patterns and trend...
IB DP Biology: HL复习笔记10.3.3 Speciation
Gradualism & Speciation Speciation can be defined as the emergence of new and distinct species that are reproductively isolated from other separate species Two theories exist to explain the eme...
IB DP Biology: HL复习笔记10.3.2 Evolution
The Process of Evolution by Natural Selection Evolution requires that allele frequencies change with time in populations Evolution is defined as the cumulative change in the heritable characteristi...
