Question

Transposable elements can cause corn kernels to be spotted if they jump in or out of the color genes during the development of the kernel. Starting with an Ac element inserted in the C gene, the sizes of the colored spots due to transposition events can vary greatly. This is because:

Larger patches of color are due to transpositions early in kernel development and smaller patches are due to later-occurring events
      
Larger patches of color are due to transpositions late in kernel development and smaller patches are due to earlier-occurring events
      
Larger patches of color are due to Ds transpositions and the smaller patches are due Ac transposition events
      
Larger patches of color are due to Ac transpositions and the smaller patches are due Ds transposition events

none of the above options is correct

QUESTION 3

Eukaryotic retrotransposons such as Ty1 and Copia are flanked by:
      
direct repeats (DRs).
      
inverted repeats (IRs).
  
long terminal repeats (LTRs).
      
long inverted repeats (LIRs).
      
None of the answer options is correct

Answer 1

Answer: 2. A

The Ds element is very important for the appearance of patches. If this element leaves Ds-c allele early then larger patches appear and when this transposition occurs late then smaller patches will appear. The reason behind this is that the restored allele will divide for lesser times.

Answer: 3. C

Flanked by LTRs these retrotransposons gag as well as pol polyproteins.