The pedigree below shows the family history for a gene that causes the absence o
ID: 8135 • Letter: T
Question
The pedigree below shows the family history for a gene that causes the absence of toenails. The allelle causing the presence of toenails is dominant to the one causing the absence of toenails.Identify on the chart the genotype of all individuals in the pedigree using the following symbols.
T = dominant allele
t = recessive allele
? = cannot be determined from the information given
(Each space in the chart is worth 1 mark)
Individual Genotpye
I-1
I-2 T T (given)
II-1
II-2
II-3
II-4 T T (given)
III-1
III-2
III-3
IV-1
IV-2
IV-3
IV-4
Explanation / Answer
NORMAL ALLELE-------t
T t x T t
T
t
T
TT
Tt
t
Tt
tt
I-1 Tt I-2 T T (given)
T
T
T
T T
T T
t
T t
T t
II-1 II-2 II-3 -----------GENOTYPES , TT, Tt-NO TOENAILS
II-4 T T (given)
T
t
T
TT
Tt
t
Tt
tt
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