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Message: <blockquote data-quote="Fenris" data-source="post: 3491147" data-attributes="member: 2820">[sblock=Rystil]OK, let's see in order for the Tralg and Nibelans to bred with Narlsewomen, indicates that all three are actaully one species. Pre-zygotic barriers  are predominantly habitat and behavioral isolation, but no mechanical or gametic isolation. No apparent post-zygotic barriers exist as the offspring are fertile. Techincally "hybrids" would be between two species, here I think we have the case of extreme phenotypes with disreuptive selection (as opposed to directional selection on Rowain).As an aside I thought of an out for the d'Toussaints, aggresive female infantcide could lead to only beautiful daughters being known, they just wouldn't come around often  <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=";)" title="Wink    ;)"  data-smilie="2"data-shortname=";)" /> Back to Scandaj. So how to get one species, with three distinct biotypes whose males all breed true from a single stock of females who share a common biotype with one of the males. Additionally two of the biotypes only produce male offspring. Assuming a standard meiotic gametic distribution, Narlse should dominate Scandaj, unless they are unable to maintain their monopoly of females (which it seems they cannot).Some hypotheses (and I can't wait to see what is really going on <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f642.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":)" title="Smile    :)"  data-smilie="1"data-shortname=":)" /> )There are sets of linked genes, two sets of alleles. These code for the proteins and transcription factors that direct development as Tralgs or Nibelans. Possibilties include Tralgs and Nibelans existing as YY creatures (and the lack of X genes explaining their defects), thus producing only Y gamettes. Alternitively some biochemistry within the Tralg/Nibelan causes the production of defective X gamettes. Third, he sets of alleles that dictate Tralgness/Nibelanness are lethal in an XX environment, some Y component being required for survival or inactivation of the lethal genes.Or going farther out. Some aspect of endoreduplication occured at some point leading to additinal chromosomes in Tralg/Nibelans, but only for sex-chromosomes. Additionally there are now three sex chromsomes, a triploid state that is tolerated in these beings (being XYY). During meiosis, one gamete will get one sex chromosome and other will get two. Non-disjunction in the sex chromosomes is quite common in Tralg/Nibelans leading to ther perpetuation of gametes with two sex chromosomes. The gametic combinations then would be X, Y, XY, or YY. Any gamete bearing a single sex chromosome will fail to form a normal zygote, since it would not be triploid for the sex chromosome. This thus prevents the birth of any females. Gamettes that are XY fuse to form a XXY zygote. These zygotes are likewise non-viable as two Y chromsomes are required to stabalize the Tralg/Nibelan biotype alleles. This leaves YY gametes as the only viable gametes, and indeed other sperm tend to have defects and have flagelation malfucntions. This leaves the YY sperm as the predominate sperm and when it fertilizes the Narlsewoman egg yields an XYY zygotes that can become a Tralg/Nibelan. <img src="http://www.enworld.org/forum/images/smilies/laugh.png"  class="smilie" loading="lazy" alt=":lol:" title="Laughing    :lol:" data-shortname=":lol:" /> You piqued my scientific curiosity. Now lets here what really happens. OK, when you have time, after the knight and jester are done.[/sblock]</blockquote>

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