The table below shows only the human chromosomes contained in the three cultures

Question

The table below shows only the human chromosomes contained in the three cultures of human-mouse hybrid cells. Five enzymes (a, b, c, d, e, f) are tested in each of the cell culture strains, with the following results:
A – active in culture strain I only
B – in all three culture strains
C – only culture strains II and III
D – only in II
E – no activity in any culture strain
Presence (+) or absence (-) of human chromosomes
Hybrid strain 1 2 3 4 5 6 7 8
I + + + + - - - -
II + + - - + + - -
III + - + - + - + -

On what human chromosomes are the genes coding these enzymes located?

Explanation / Answer

chromosome 4

A – active in culture strain I only

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