Let P the taster allele and p the allele for no -tester.
A the allele for normal and a for albinism.
The genotype of heterozygous is PpAa and genotype of albino woman and heterozygous for taster = Ppaa.
As shown in the cross the frequency of taster and normal is 3/8
frequency of a taster and albino is 3/8
frequency of non-taster and normal is 1/8
frequency of a non- taster and albino is 1/8.
According to the binomial probability, the chance of any combination of phenotypes is given by
A - !Number of progenies/ ! number of white (m)* ! number of tasters and normal (n)* (number of non-taster and albino) m * (Probability of white)n
Frequency of taster and normal is 3/8
Frequency of non- taster and albino is 1/8
Number of progenies = 6
Frequency of taster and normal is 3
Frequency of non- taster and albino is 3
6! / 3! 3! (3/8)3 * (1/8)3
6*5*4*3*2*1 / (3*2 *3*2) 3*3*3/ 8*8*8*8*8*8
5* 4 * 3 *3 *3 / 8*8*8*8*8*8*8
540 / 262144 = 0.002
B-
Frequency of taster and normal is 3/8
Frequency of non- taster and albino is 1/8
So probability of first 3 children as a taster and normal and last three children as non- taster and albino is
3/8 *3/8 *3/8* 1/8 *1/8 *1/8 = 3*3*3/8*8*8*8*8 *8 = 0.000103
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2. A man heterozygous at both the locus for PTC tasting (see tutorial 2, problem 4)...
2. A man heterozygous at both the locus for PTC tasting (see tutorial 2, problem 4) and at the locus for albinism (see tutorial 2. problem 1) marries an albino woman heterozygous at the PTC tasting locus. These two loci assort independently. a) what is the probability of producing 3 tasters with normal pigmentation and 3 non-taster albinos in a family of 6 children? (2 marks) b) what is the probability of producing 3 tasters with normal pigmentation and 3...
2. A man heterozygous at both the locus for PTC tasting and at the locus for albinism marries an albino woman heterozygous at the PTC tasting locus. These two loci assort independently. a) what is the probability of producing 3 tasters with normal pigmentation and 3 non-taster albinos in a family of 6 children? b) what is the probability of producing 3 tasters with normal pigmentation and 3 non- taster albinos in that order in a family of 6 children?
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