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biology 0610printed 234 · PDF 234
328 pagesrevision 46933
printed 234 · PDF 234
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Green eyes= b
Using your symbols, write the 3 possible genotypes and the phenotypes that
each genotype produces. Tell which genotype is homozygous and which is
heterozygous?
ANS.
GENOTYPE
PHENOTYPE
BB (Homozygous)
Brown Eyes
Bb (Heterozygous)
Brown Eyes
Bb (Homozygous)
Green Eyes
Codominance:
Alleles that are both expressed in the phenotype when they both are
present. E.g Blood groups are examples of Codominance.
From the table below we can deduce that Alleles IA and IB are codominant but are
dominant to IO
Protein Synthesis
DNA is a protein molecule found in the nucleus of cell made up of 2 long strands of
molecules called nucleotides
There are 4 different nucleotides each containing a different base-A,C,T,G.
GENOTYPE
PHENOTYPE
IAIA
Blood Group A
IAIB
Blood group AB
IAIO
Blood Group A
IBIB
Blood Group B
IBIO
Blood Group B
IOIO
Blood Group O