The data below comes from a young couple who both have siblings with a genetic d
ID: 67365 • Letter: T
Question
The data below comes from a young couple who both have siblings with a genetic disorder of amino acid metabolism. The amino acid pathway that is disordered has 4 enzymes coded for by 4 independently assorting genes. You have the RFLP data collected from the couple (C1 and C2) their parents and their affected sibs (C1’s parents are P1 and P2 and the affected sib is S1) (C2’s parents are P3 and P4 and her affect sib is S2). Their parents are unaffected by the disorder. Each gene has an RFLP that is linked to the gene.
1) Based on this data is there a significant chance a child born to C1 and C2 will have the disorder? Explain why.
2) Are C1 or C2 carriers for the disorder? Explain why.
3) What is the probability a child born to C1 and C2 could be a double?
RFLP FOR GENE 1
size
P1
P2
S1
C1
C2
S2
P3
P4
14kb
X
X
X
X
X
10kb
X
X
X
X
8kb
X
X
X
4kb
X
X
X
RFLP FOR GENE 2
size
P1
P2
S1
C1
C2
S2
P3
P4
16kb
X
X
X
X
X
10kb
X
X
X
X
6kb
X
X
X
2kb
X
X
X
RFLP FOR GENE 3
size
P1
P2
S1
C1
C2
S2
P3
P4
20kb
X
X
X
X
X
15kb
X
X
10kb
X
X
X
X
X
X
45Kb
X
X
RFLP FOR GENE 4
size
P1
P2
S1
C1
C2
S2
P3
P4
12kb
X
X
X
X
10kb
X
X
X
X
X
X
X
8kb
X
X
6kb
X
size
P1
P2
S1
C1
C2
S2
P3
P4
14kb
X
X
X
X
X
10kb
X
X
X
X
8kb
X
X
X
4kb
X
X
X
Explanation / Answer
C1 is a carrier of the disorder which is the 10kb DNA (in all the four genes).14kb DNA of P1 and C1 are not involved in the disorder.
C2 is also carrier of the disorder which is the 10kb DNA of gene 4 and 20Kb DNA of gene 3.
so, a cross between C1 and C2 is likely to have an affected offspring..
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