The normal sequence of a certain Drosophila chromosome is ABC*DEFGHI, where the

Question

The normal sequence of a certain Drosophila chromosome is ABC*DEFGHI, where the * represents the centromere. Aberrant chromosomes with the structures shown below were isolated. In parts a) and b). give the correct term for each type of rearrangement and show how each rearranged chromosome would pair with its normal homolog during melosis I (label the chromosomes in your drawings) ABC*DHGFEI ABC*DEFEFGHI What are the genotypes of the melotic products resulting from of a single crossover between F and G of the paired homologs of part (a).

Explanation / Answer

1)      Inversion

----A-------B -----C ------X ----------D-----------E----------F--------G----------H-----I----

----A-------B -----C ------X ----------D-----------H---- G------F--------E---------------I---

2)      DUPLICATION

--A-------B -----C ------X ----------D-----------E----------F--------G----------H-----I----

--A-------B -----C ------X ----------D-----------E----------F---- E-- -- F--G----------H-----I----

3)

----A-------B -----C ------X ----------D-----------E----------F--------G----------H-----I----

----A-------B -----C ------X ----------D-----------H---- G------F--------E---------------I---

PRODUCTS   ARE

A-------B -----C ------X ----------D-----------E----------F-------- G------F--------E---------------I---

A-------B -----C ------X ----------D-----------H---- G------F- ---G----------H-----I----

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