No, you're not a pest :) I really don't mind researching this stuff 'cause it really is interesting. Stuff like this is what makes the "what is a species" questions so hard so answer, for example, and unfortunately, I'm probably going to be tripping over that question often enough.
H'okay, first of, saying "impossible" in nature is probably going to result in some action of the "nature hands scientist's ass over on a platter" variety. (Flying fish? Life without sunlight? Aloha.) .I'd say that reproducing by all three is unlikely, just because it'd incur such an effort on the species - three methods, three strategies, so much energy wasted! What to do? When to do it? *gametes run around frantically*
Let's see... Hybridogenesis and normal sexual reproduction is, I think, not going to happen if you still want the offspring to a hybrid (unless I'm totally screwing up on science - quite possible), because the hybrid has a nasty combination of chromosomes from different species which can't match up during meiosis (which is why it dumps dad's genes), so it can't not dump the genes and divide them up them pair them with another hybrid's gametes.
You could have hybridogenesis and quasi-normal sexual reproduction (Hybrid x Hybrid) without getting a Parent Species as the offspring if these was chromosomal crossover (http://en.wikipedia.org/wiki/Chromosomal_crossover) (cut-and-paste between chromosomes resulting in transfer between them) in the unlikely event that a Species A and B chromosome lookalike accidently paired up (also known as Things Going Horribly Wrong). This means that some parental DNA could slip into a Maternal chromosome and thus avoid the Great Dumping. What horrifying offspring would result, I don't know.
Parthenogenesis and hybridogenesis would work fine genetically. It's just a matter of having the right parts and mechanisms.
So in sum, having all three's unlikely because of all the work that would have to go into it (both from the organism's pov and evolutionarily speaking). Having one back-up reproductive method may pay off if , for example, you forsee the species colonizing deserted islands.
Remember the whiptail (http://en.wikipedia.org/wiki/Parthenogenesis#Reptiles), which is descendent from hybrids and is now stuck with parthenogenesis as its only option. I don't know whether they could ever go back to hybridization.
This is also very interesting: An interesting aspect to reproduction in these asexual lizards is that mating behaviors are still seen, although the populations are all female. [...] Lizards who act out the courtship ritual have greater fecundity than those kept in isolation, due to the increase in hormones that accompanies the mounting. So, although the populations lack males, they still require sexual behavioral stimuli for maximum reproductive success.
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Date: 2008-07-03 08:16 pm (UTC)H'okay, first of, saying "impossible" in nature is probably going to result in some action of the "nature hands scientist's ass over on a platter" variety. (Flying fish? Life without sunlight? Aloha.) .I'd say that reproducing by all three is unlikely, just because it'd incur such an effort on the species - three methods, three strategies, so much energy wasted! What to do? When to do it? *gametes run around frantically*
Let's see... Hybridogenesis and normal sexual reproduction is, I think, not going to happen if you still want the offspring to a hybrid (unless I'm totally screwing up on science - quite possible), because the hybrid has a nasty combination of chromosomes from different species which can't match up during meiosis (which is why it dumps dad's genes), so it can't not dump the genes and divide them up them pair them with another hybrid's gametes.
You could have hybridogenesis and quasi-normal sexual reproduction (Hybrid x Hybrid) without getting a Parent Species as the offspring if these was chromosomal crossover (http://en.wikipedia.org/wiki/Chromosomal_crossover) (cut-and-paste between chromosomes resulting in transfer between them) in the unlikely event that a Species A and B chromosome lookalike accidently paired up (also known as Things Going Horribly Wrong). This means that some parental DNA could slip into a Maternal chromosome and thus avoid the Great Dumping. What horrifying offspring would result, I don't know.
Parthenogenesis and hybridogenesis would work fine genetically. It's just a matter of having the right parts and mechanisms.
So in sum, having all three's unlikely because of all the work that would have to go into it (both from the organism's pov and evolutionarily speaking). Having one back-up reproductive method may pay off if , for example, you forsee the species colonizing deserted islands.
Remember the whiptail (http://en.wikipedia.org/wiki/Parthenogenesis#Reptiles), which is descendent from hybrids and is now stuck with parthenogenesis as its only option. I don't know whether they could ever go back to hybridization.
This is also very interesting: An interesting aspect to reproduction in these asexual lizards is that mating behaviors are still seen, although the populations are all female. [...] Lizards who act out the courtship ritual have greater fecundity than those kept in isolation, due to the increase in hormones that accompanies the mounting. So, although the populations lack males, they still require sexual behavioral stimuli for maximum reproductive success.