4) For the following four merodiploids determine whether the products of the Z a
ID: 177740 • Letter: 4
Question
4) For the following four merodiploids determine whether the products of the Z and Y genes (ß-galactosidase and lactose permease, respectively) are made in the absence or presence of lactose. P indicates promoter.
ß-galactosidase
lactose permease
genotype
– lactose
+ lactose
– lactose
+ lactose
A) i – p – o c z + y + / i + p + o + z –y –
B) i + p – o + z + y + / i – p + o + z +y –
C) i + p + o c z – y + / i + p - o + z +y –
D) i s p + o + z + y - / i - p + o c z - y +
ß-galactosidase
lactose permease
genotype
– lactose
+ lactose
– lactose
+ lactose
A) i – p – o c z + y + / i + p + o + z –y –
B) i + p – o + z + y + / i – p + o + z +y –
C) i + p + o c z – y + / i + p - o + z +y –
D) i s p + o + z + y - / i - p + o c z - y +
Explanation / Answer
ß-galactosidase
lactose permease
genotype
– lactose
+ lactose
– lactose
+ lactose
A) i – p – o c z + y + / i + p + o + z –y –
-
-
-
-
B) i + p – o + z + y + / i – p + o + z +y –
-
+
-
-
C) i + p + o c z – y + / i + p - o + z +y –
-
-
+
+
D) i s p + o + z + y - / i - p + o c z - y +
-
-
+
+
‘+’ - positive for expression
‘-‘ -no expreson
ß-galactosidase
lactose permease
genotype
– lactose
+ lactose
– lactose
+ lactose
A) i – p – o c z + y + / i + p + o + z –y –
-
-
-
-
B) i + p – o + z + y + / i – p + o + z +y –
-
+
-
-
C) i + p + o c z – y + / i + p - o + z +y –
-
-
+
+
D) i s p + o + z + y - / i - p + o c z - y +
-
-
+
+
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