Biology · Oct / Nov 2024 · Paper 42 · Question 5
0610
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Fig. 5.1 is a pedigree diagram showing the inheritance of blood group in one family. B 1 A 2 A 5 O 6 O 7 O 8 O 9 AB 4 B 3 key female male Fig. 5.1
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5(a)[2]
4 ;
3 ;
5(b)[2]
limited number of phenotypes / AW ;
no intermediates / AW ;
5(c)[1]
seed shape / seed colour / AVP ;
5(d)[2]
ref. to IA and IB alleles ;
IA and IB alleles both contribute to phenotype
/ ref. to AB blood group ;
5(e)[4]
gametes
IA, Io and IB, Io ;
genotypes
IAIo, IAIB, IBIo, IoIo ;
phenotypes A, AB, B, O ;
probability 0.25 / 25% / 1 in 4 ;
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