IB DP Biology: HL復習筆記11.1.6 Histamines
Production of Histamines Histamines are?chemicals?created by the body in?response to allergens?such as pollen, pet dander, food substances or dust Allergens are antigens?and so they are encountered...
IB DP Biology: HL復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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...
IB DP Biology: HL復習筆記10.3.1 Gene Pools
Gene Pools A gene pool consists of all the genes and their different alleles, present in an interbreeding?population Some populations of the same species are geographically isolated from each other...
IB DP Biology: HL復習筆記10.2.6 Variation
Types of Variation The ways in which organisms differ from one another is called?variation Variation occurs?between species In fact, species are classified based on differences between their respec...
