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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 po c z + y + / i + p + o + zy

B) i + po + z + y + / ip + o + z +y

C) i + p + o c zy + / 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 po c z + y + / i + p + o + zy

B) i + po + z + y + / ip + o + z +y

C) i + p + o c zy + / 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 po c z + y + /  i + p + o + zy –  

-

-

-

-

B)  i + po + z + y + /  ip + o + z +y –  

-

+

-

-

C)  i + p + o c zy + /  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 po c z + y + /  i + p + o + zy –  

-

-

-

-

B)  i + po + z + y + /  ip + o + z +y –  

-

+

-

-

C)  i + p + o c zy + /  i + p - o + z +y –  

-

-

+

+

D)  i s p + o + z + y - /  i - p + o c z - y +  

-

-

+

+

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