A simple evolution question. Can you give information?

Question

With the simple knowledge that Down's Syndrome is caused by a single chromosonal change, how is it even possible for complete chromosonal changes to bring about species to species changes? how can evolution explain both the addition of genetic material and the bringing about exact changes in both male and female (for mating)?
accepting, for the moment, that evolution could have produced a viable couple, how would they survive without similar parents to teach them to survive and to protect them, as most, not all, creatures alive now destroy radically different offspring?
I don't claim to be an expert so don't slam me for a question. that's what we are here for, right?

Answer 1

I would love to answer but your question is not clear. But I think you are asking how two similar creatures can create a radically different creature. Evolution usually works much slower than that. Therefore every next step in the process has parents that are similar (only slightly different) then themselves, but the slight mutations that occur from sexual reproducations may have made the offspring slightly more likely to survive than its peers, this over many generations would allow this trait to take over as predominant in the population. Another question I think you are asking is how did we get both male and females of a species. Well microscopic organisms began as Asexual reproducers. Eventually some mutations occurred that allowed the organisms to share genetic material, very simply at first. As time went by organisms that could share genes better survived better. Therefore a process was slowly developed. If you clear up your question I can answer you better, for now here you go.

Answer 2

Think about this: In the current environment, Trisomy 21 (Dowm Syndrome) is a disadvantage. What if the environment changed to a condition where the lower metabolism of Trisomy 21 were a bigger advantage over standard genotypes than the other features of it were a disadvantage? Now, add the possibility of some mutaion in the gene sequence, even in a single generation, that eased the disadvantages of Down Syndrome. Wouldn't that in effect be a almost a new species in a single generation?

People with Down Syndrome can and do occaisionally have offspring with people who do not have it. Sometimes Trisomy 21 is passed to the next generation. Of course, smaller genetic changes do this too, but that should answer your question about the "exact changes in both male and frmale".

Even Mules and Jennies are sometimes fertile, btw.

I don't look at evolution as being adapting to the environment so much as I look at it being random changes that by chance give an advantage during times when the environment changes.

Answer 3

Ok, first to address the brilliance of the first poster, Darwin was actually a pretty devout Christian at the time of his voyage. And the term theory in a scientific sense is much different then an everyday ordinary theory.

Now since you actually asked question in order to understand the topic better I assume you're going to openminded..?

Ok, Down's syndrome first. What actually happens, to the best of my understanding, is that when the sperm or egg is first produced, there's an extra copy of the twenty first chromosome. So when egg meets sperm, there are actually three copies of #21. Baby developes and so you have it.

How far in depth do you want to go? How can you change genetic information...well, mutations, natural selection, sexual selection, climate shifts, and even location shifts.

What do you mean by this question? "how can evolution explain both the addition of genetic material and the bringing about exact changes in both male and female (for mating)?"

You falsely assume that all mutations or evolution is bad. If something is more fit for the environment, it's less likely to need protected, correct? I don't really know what you're trying to get at...

I won't slam you, I'm no expert either I just enjoy the stuff...

Answer 4

Let me answer this question (from my own interpretation) in another way.

Suppose we have a two brown rabbit families living in two different environments, the arctic and african desert. if there are no genetic mutations within the reproduction generations, we assume the population living in the arctic will quickly be wiped out due to predation (brown stands out in the white snow). However, if there is a mutation (chromosomal change) in both the families such that one baby bunny from each family now has white fur.

the white baby in the african desert can easily be spotted by predators, while the white rabbit in the snow can hide in the snow easily and supposedly be able to survive until it can reproduce.

Now, this white bunny will pass the mutated gene which codes for white fur to its own offspring, and the probability of these offspring to survive is better and hence can produce even more white offspring. eventually, the original brown family will become white in the arctic, while the family in desert remains brown.

However, when such a mutation (into white fur) occurs is unknown, and due to chance. If such a mutation does not take place at all, the population will be exterminated.

Answer 5

In evolution, one species doesn't come out of another. The gene pool continues to have small changes, until if you compare generation 1 with generation 10,000, they are different species. But each generation is the same species as the one before it, and the one after it.

look up "Ring Species" for some interesting examples of how species can be the same, and different. Ring Species are like living examples of how evolution works. In evolution, the small changes are seen across time. In a ring species, the small changes are seen across geographical locations.

Answer 6

what u are asking is may be why there are two different genders, and how evolution can explain them? this can be explained by a very established theory in evolution called as 'battle of sexes'. which states that both sexes are evolved due to having different strategies in game of reproduction and for getting more and more benefit from each other ( sexes) in terms of number of offspring produced. the gender evolved by production of syngamy.

Answer 7

Down's Syndrome is not caused by a chromosomal change so much as a molecular change within a chromosome. Specifically it is caused by a transcript error in one nucleobase, that then acts as a blocking codon for protein assemblage by a gene.

These kinds of transcription errors happen infrequently. Many times they lead to disease mutations such as Down's Syndrome, and are not generally favored by natural selection. Sometimes a transcription error will lead to a trait that better adapts to some ecological circumstance as thus be favored by natural selection.

Answer 8

Not really a simple evolution question, but here's a simple answer with a twist: That's why it's the THEORY of evolution. because there is no real explanation, only a theory that scientist came up with because they didn't want to believe in God. don't over analyze science unless you have to do it for school in which case only over analyze the stuff you actually have to use for tests and passing the class since you have to get an education to survive in the material world we've created for ourselves. Now you have something else to over analyze.