Table 1 Predictions about gene losses from U and V chromosomes.

From: The mysterious sex chromosomes of haploid plants

Gene expression

Loss from U

(female-determining)

Loss from V

(male-determining)

Male gametophyte-specific

Yes

No

Female gametophyte-specific

No

Yes

Gametophyte vegetative stage

Unlikely, but function may deteriorate

 

Sporophyte specific: such a gene can be lost from the U or the V, but not both

Yes

Yes

  1. Most genes should be retained on both the U and V.
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