Sorry, but there is nothing yet known as a replacement for x and y chromosomes.Perhaps your query is too complicated? For example there are alternatives to the following parts of your query:
Maybe some reasonable answers will be found next time you come. |
Your alternative for x and y chromosomes is not listed? Suggest! |
No companions for x and y chromosomes have been suggested so far. |
You have in mind a companion for x and y chromosomes and it is not yet here? Propose! |
x and y chromosomes |
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