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Sometimes yes, and the vast majority of the time, no. Some animals that are very closely related (like lions and tigers) occaisionally can cross breed, producing a liger or tigon, but these are not reproductively viable.
I'd also make it a point to 'big picture' what you've learned every week or so. On Friday, try and look back to see how everything that you've covered in the previous week fits together, to get more of a cohesive understanding of the things you're studying.
In pretty much all species that's a factor. The healthiest looking females are most likely to be healthy, and thus bring the healthiest next generation possible into the world. The strongest and healthiest males try to claim those females for the same reason. If you want a specific example of this, ...
It's going to be hard to visualize if you think of it like that. Here's how I picture it: The parent amoeba copies its genetic material, and then splits in half. Each half has one complete set of the genetic material, and each half is a fully functioning amoeba. Does that help at all? I can try to c...
I guess I'm a little confused about your question, but a chromosome (as depicted on a karyotype chart) is the individual's genome condensed to make it ready for replication; chromosomes are just specific parts of the DNA. There are 23 of these distinct parts, and two copies of each. No more, no less...
I don't know if it's such a big physical difference as what you're describing, but here are some observations that I've made: My cat is often very sluggish right after waking up, walking slowly and not particularly alert. If he is startled awake he is very quickly alert, but then again so am I (like...
- Mon Jun 04, 2007 6:10 am
- Forum: Human Biology
- Topic: Question About Reproductive Organ (Male)
- Replies: 13
- Views: 9406
It's not a muscle, so don't bother trying to exercise it like you would with weights or anything. Some products claim to break down the tissue, which makes it build up again stronger (just like happens with body-building); however, because the penis is not a muscle this won't work. Your friend might...
- Fri May 18, 2007 8:29 pm
- Forum: Physiology
- Topic: Is it true that only human famales have a hymen
- Replies: 2
- Views: 9123
I don't know about any animals other than humans, but here's what I know about them in humans: The hymen is a mucous membrane in the vagina. It can be punctured or torn, through sexual intercourse or even things like bike riding. The purpose is uncertain, since it's not terribly uncommon for a girl ...
- Sun Mar 25, 2007 12:26 am
- Forum: Zoology Discussion
- Topic: Perspiration among carnivores [mammals].
- Replies: 11
- Views: 12868
I can't say for sure, but possibly it has something to do with smell? I don't know exactly why you ruled it out right away... but sweat has a pretty strong smell, and maybe prey would be able to pick up on it? Like I said, just a guess...
- Thu Mar 22, 2007 8:42 pm
- Forum: Botany Discussion
- Topic: Memorising Scientific names
- Replies: 3
- Views: 3013
I agree with mith- do it a few at a time. Learn say, 5 names per session, and before you start a new session check to make sure you remember all of the names before it. I would start by memorizing the names from scientific to common (Heterophylus means jack fruit, for example), and then once you're ...