Thanks!
So isolating barrier would be something like a mountain separating two populations, or polyploidy in some individuals preventing interbreeding?
No worries!As in, plants that are tetraploid (4n) can't successfully fertilise plants that are diploid (2n).
First one is correct, the second one almost so. The isolating barrier need not be geographical, it can also be behavioural in that two groups will not mate with each other - this doesn't need to have an explicit genetic basis (by "polyploidy", did you mean "polymorphism"? If so, the statement is correct).
In differentiating between microevolution and macroevolution:
Micro: VSSR - Variation within a species, Selecting factor/agent, Survival of the fittest, Reproduction.
Macro: VISSR - Variation within a species, Isolating barrier, Selecting factor/agent, Survival of the fittest, Reproduction.
The first S in mine is a little more specific than yours, as it explicitly mentions the application of a selecting factor :P
CUT the PYRamid
Cytosine, Uracil and Thymine are Pyrimidines.
When mentioning macroevolution, does the physical barrier lead to allopatric speciation? That is, the physical barrier separates the two groups, which are exposed to different selecting agents in their respective environments?
Ruining Douchy's thing here :P
You get a CUT from a PYRamid because they are sharp :P
Ruining Douchy's thing here :P
If you prefer the other one (its heaps easier to remember imo)...I learnt it asSpoilerKevin Puts Condoms On For Great Sex
Ah, I see. In this case, the different ploidys are not true isolating barriers. I'd be more inclined to label it as a form of speciation or microevolution.
Polymorphism is literally "many forms" - think black skin colour and white skin colour, or sexual dimorphism where the male of a species differs significantly to the female of that same species.
In the context of your question: If a population of, for example, green beetles splits into two colonies and one colony develops a red colour over time due to a selecting factor, these colonies may not mate even if they can technically produce fertile offspring. This is a form of behavioural isolation resulting from polymorphism.
Ah, I see. In this case, the different ploidys are not true isolating barriers. I'd be more inclined to label it as a form of speciation or microevolution.
Polymorphism is literally "many forms" - think black skin colour and white skin colour, or sexual dimorphism where the male of a species differs significantly to the female of that same species.
In the context of your question: If a population of, for example, green beetles splits into two colonies and one colony develops a red colour over time due to a selecting factor, these colonies may not mate even if they can technically produce fertile offspring. This is a form of behavioural isolation resulting from polymorphism.
I.e. horses and donkeys can mate, it wouldn't under natural conditions because of the biological cost