The following diagram represents two nonhomologous chromosomes: A B ? C D E F G
ID: 36186 • Letter: T
Question
The following diagram represents two nonhomologous chromosomes:
A B ? C D E F G
R S ? T U V W X
What type of chromosome mutation would produce the following chromosomes? Be specific with regards to the movement of segments (meaning use the letters for reference).
a. A B ? C D
R S ? T U V W X E F G
b. A U V B ? C D E F G
R S ? T W X
c. A B ? T U V F G
R S ? C D E W X
d. A B ? C W G
R S ? T U V D E F X
Explanation / Answer
a. A B ? C D
R S ? T U V W X E F G- this is a frame shift mutation. the lower frame has shifted to the left by one base thus causing a mutation.
b. A U V B ? C D E F G
R S ? T W X - Insertions are mutations wherein extra base pairs are inserted into a new place in the original DNA strand. this can also be called inversion mutation
c. A B ? T U V F G
R S ? C D E W X - this is an inversion mutation, wherein two breaks occur in one chromosome, sometimes the region between the breaks rotates 180 degrees before rejoining with the two end fragments. Such an event creates a chromosomal mutation called an inversion.
d. A B ? C W G
R S ? T U V D E F X - this too is an inversion mutation.
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