16. The maternal copy of chromosome 19 has undergone an inversion such that its

Question

16. The maternal copy of chromosome 19 has undergone an inversion such that its new ordering is as follows:

A-*-B-E-D-C-F(* denotes the centromere).

The normal ordering of the paternal copy is as follows:

a-*-b-c-d-e-f.

According to the location of the affect chromosome region with respect to the centromere, how would this inversion be classified?

17. Assume the crossing over occurs between d and e during meiosis. Denote all possible monads in the gametes using the asterisk and upper and lower-case letters as above.

18. Gametes containing which of the above monads would NOT be expected to be viable?

Explanation / Answer

3. Non-viability is only when a important gene which is essential for survival (ex. House-keeping genes) is missing. Since in the above crossover deletion of any gene is not occuring and hence, all the monads will be viable.

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