1) The following sketch shows a region of the mais genomesubdivided into 10 zones. Seven deletions have been mapped to thezones as shown. The DNA region between the parentheses is removedby the deletion.

    | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10|

D1-------------(          )------------------------------------

D2-------------------(                )------------------------

D3-(          )------------------------------------------------

D4-------------------------------(          )------------------

D5-------------------------------(                      )------

D6-------------------(          )------------------------------

D7-------(                      )------------------------------

a) Plants carrying a point mutation located in zone 4 (calledmutation 4-1) are mated separately with the 7 deletions mentionedabove. Give a general justification and thenindicate by yes or no whether pseudodominance occurs in thefollowing crosses:

1: D1 X 4-1, 2: D3 X 4-1, 3: D4 X 4-1, 4: D6 X 4-1.

b) A frameshift mutation results in pseudominance effect whencrossed with D2, D4, and D5 only. In which zone is this mutationlocated? Justify briefly.

c) Is there a gene in the zone identified in question b)? If yesexplain your reasoning. (hint: rerad question above,and think mutation type)