All Questions
9 questions
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At what point in evolution is a new species identified? [duplicate]
As we know, a change in allelic frequency leads to evolution, and as these changes accumulate a new species is created.
My question has two parts -
A classical definition of species which is now not ...
- 109
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votes
2
answers
272
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When is it better for a gene to cause a biased sex ratio?
Because genes are selfish and want to maximise their transmission from generation to generation, if they can distort a population's sex ratio, isn't it always in their interest to cause a biased sex ...
3
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2
answers
463
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Human ancestor reproduction after chromosome fusion
I read somewhere that human chromosome 2 is the result of 2 primate chromosomes fusing together somewhere along our evolutionary journey. This is why we have 23 chromosomes while other primates have ...
- 31
8
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1
answer
407
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Polyploidy, or why plants of different species can produce fertile offspring hybrids more frequently than animals?
This site says:
Plants hybridize much more frequently and successfully than animals do. [...] Chromosomal doubling (polyploidy) occurs more frequently in plants and facilitates the fertility of the ...
- 1,313
1
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0
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33
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what chromatin factors are the most potent supressors of meiotic crossover?
I think linker histone H1 is probably involved, but the literature is scant. What else prevents crossovers from becoming hyper-frequent during meiosis?
- 382
1
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1
answer
64
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Study case of the inheritance system of Oenothera
I've been told some interesting facts about oenothera. Apparently in this species some lineages have been through some translocations and in results to these translocations and in consequence, some ...
- 68.3k
4
votes
2
answers
781
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Why did Fair Meiosis evolve?
How and why did Fair Meiosis evolve?
I can hardly think that it provided a fitness advantage to the individual carrying the mutation. Why would it? Or did it evolve through lineage selection? Or was ...
- 68.3k
5
votes
2
answers
443
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Randomness in living systems
The point of my question is not to talk about events that are uncontrolled by living organisms. My question is about controlled randomness, or I'd like to say adaptive random process. Process that are ...
- 68.3k
14
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3
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Why doesn't recombination occur in male Drosophila?
"Males do not show meiotic recombination, facilitating genetic studies."
For a while I have known that this phenomenon occurs, this quote comes from the Wikipedia page on Drosophila melanogaster, and ...
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