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mex mex
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7 years ago
http://imgur.com/a/YBJVj

Hi, for this question I worked out the haploid number of the dox to be 29 and the diploid number of the dox to be 58. I don't understand why the hybrid is sterile as surely 29 homologous pairs of chromosomes can form, no?
Thanks.
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7 years ago
The dog forms a haploid sex cell with 1n = 39 chromosomes. The fox forms a haploid sex cell with 1n = 19 chromosomes.

These two haploid cells can get together in fertilisation and the resultant embryo can undergo mitosis no problems so you can form an adult dox.

The problem really is with meiosis - the first meiotic division requires that homologous chromosomes (one from each parent) pair up during late prophase. Of course this isn't possible because the dog provided 39 and the fox provided 19.....39 and 19 can not match up so meiosis fails and the dox can not form viable sex cells.
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