Linked Questions

0
votes
0answers
30 views

Evolution in Biology Species [duplicate]

what a species is, why it is so difficult to define, and how we should best determine the boundaries between species. This is the basic general definition: A species is often defined as the largest ...
82
votes
5answers
26k views

How could humans have interbred with Neanderthals if we're a different species?

To be clear, I'm not doubting that homo sapiens and homo neanderthalensis did interbreed: of that much I'm convinced. Within the past few years I've seen an upcropping of pop-sci articles discussing ...
31
votes
6answers
4k views

Why are there species instead of a continuum of various animals?

As I understand it, various animal traits have to evolve gradually, but what happens to the species that are "neither here nor there"? To put it differently, if a species evolved from another, it did ...
11
votes
3answers
3k views

Species with reproduction barriers that can both reproduce with a third species

To start with, I do not have a sound knowledge in biology or any formal education in the area. I was told that one of the definition of a species is a reproductive barrier, which means that if two ...
3
votes
4answers
669 views

Is an egg classified based on the species inside it, or by the species that laid it?

Basically what I'm asking is if an animal of species x were to lay an egg, and the animal inside that egg happened to be the first member of a genetically new ...
4
votes
2answers
2k views

How do taenia form a species?

I know that there are many hermaphrodite animals and plants. But many of them seem to still exchange genes by mating with another member of their species. I now happened to read the Wikipedia ...
4
votes
1answer
320 views

Was Darwin aware of the difficulties behind the concept of species?

Introduction The concept of species is a very old concept that suffers from not being a natural category. There exists no single definition that would categorize living beings into groups and that ...
0
votes
1answer
990 views

How is DNA testing used to differentiate between different species?

How is DNA testing used to determine that specimens belong to different species, rather than being subspecies, or members of the same species? Usually the definition of species is about the ability to ...
7
votes
1answer
277 views

Viruses selected by evolution

I had a conversation with a family member who is a bio-computer-scientist and he talked to me about what his colleagues (biologist) are doing and I feel confused about it. They work in Chile and are ...
4
votes
1answer
411 views

Are there examples of now-living species where one is descended from the other?

I'm not a biology person so please forgive me if this question is formulated badly :) I'm curious. Are there any species that has an ancestor species that is still alive today?
8
votes
1answer
186 views

How to determine whether a newly discovered dinosaur is not a young one and not an entirely different species?

Every once in a while, there is an official announce that a new species has been discovered. For example, paleontologists have recently discovered a dinosaur they named Nanuqsaurus hoglundi, which ...
1
vote
3answers
182 views

Definition of species - location of gene

I know that species have been classified on basis of reproduction , DNA similarity , niche, etc. Has there been a classification based on locus of genes ? What are the drawbacks/shortcomings of ...
1
vote
1answer
77 views

Why did Darwin say “the misfortune to undertake”?

Why did Darwin say "the misfortune to undertake"? "Every naturalist who has had the misfortune to undertake the description of a group of highly varying organisms, has encountered cases (I speak ...
-1
votes
1answer
56 views

Estimate for number of genes changed in speciation between a megafauna parent and child species [closed]

At least in terms of a back-of-the-envelope calculation, what is a believable range for the number of gene changes between parent and child species to represent speciation between species of megafauna?...