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Explain why a person whose blood group is AB expresses both A and B antigens on the surface of their red blood cells
A and B are codominant so both genes transcribed meaning both antigen proteins are produced
define phenotype
characteristics that alleles produce
define monogenic inheritance
where one phenotypic characteristic is controlled by a single gene
what is genetic drift?
change in population's alleles frequencies that occur due to chance rather than selection pressures
In what type of environment does directional selection take place in?
changing
define dihybrid inheritance
2 phenotypic characteristics are determined by 2 different genes present on two different chromosomes at the same time
in what type of environment does stabilising selection take place in?
non-changing
What is stabilising selection?
how many genes code for continuous variation?
multiple
What is directional selection?
what is locus?
fixed position of a gene on a chromosome, alleles of a gene are found at the same locus
what is disruptive selection?
2 populations are reproductively isolated and exposed to different selection pressures which drives evolution in different directions
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