Search found 155 matches

by Khaiy
Fri Apr 21, 2006 7:42 pm
Forum: Human Biology
Topic: infectious diseases
Replies: 8
Views: 4654

Sorry bionewbie, your thread got hijacked!! All that I know about measles is that it's a pathogen that can be spread through respiration, including aerosol transmission, which makes it easier to spread. As to why it spreads so aggressively, I'm not sure. But 90% of people without immunity who live i...
by Khaiy
Fri Apr 21, 2006 6:57 pm
Forum: Human Biology
Topic: infectious diseases
Replies: 8
Views: 4654

There's also the issue of resistance. If you've caught one strain of a cold for example, your body will be pretty good at fighting off an identical infection later on. But colds and flus changes very rapidly, and every year or so there is a new strain that is prevalent in an area. That's why some pe...
by Khaiy
Fri Apr 21, 2006 6:53 pm
Forum: Evolution
Topic: Tree of life
Replies: 13
Views: 9918

Sorry! I misunderstood what you meant by HGF. But HGF just moves genes around in a population, without having to wait for successive generations. Evolution is still the change in frequency of genes in a population, so HGF is an evolutionary process, and therefore can't nullify the theory. It isn't a...
by Khaiy
Fri Apr 21, 2006 6:48 pm
Forum: Zoology Discussion
Topic: Basking Sharks-Ectotherm
Replies: 7
Views: 6755

It's possible that they are gaining heat from the sun while they feed on plankton, but I'm not 100% sure. Where do these sharks live? If they live in warm water areas they may be able to use the warm water to regulate their temperature, rather than lizards who lose heat to the surrounding air consta...
by Khaiy
Fri Apr 21, 2006 6:44 pm
Forum: General Discussion
Topic: Nerve Impulses
Replies: 2
Views: 3693

When you are touched (enough for you to feel, anyway), the nerves in that area of your body are compressed. These nerves respond to compression. Voltage gated ion channels, located on the axon, open up. Sodium ions (positively charged) rush in through the suddenly open channels, attracted by the neg...
by Khaiy
Fri Apr 21, 2006 6:33 pm
Forum: Genetics
Topic: monohybrid cross
Replies: 3
Views: 4944

Actually, I disagree. From a monohybrid cross, you should get a 1:2:1 ration, of homozygous dominant:Heterozygous:Homozygous recessive. So, there would be some offspring in the F1 that do not have both alleles, and thus could not have an intermediate phenotype (and that's assuming that the trait you...
by Khaiy
Fri Apr 21, 2006 4:55 pm
Forum: Evolution
Topic: Exam questions
Replies: 3
Views: 2550

1.) Many guesses have to be made about organisms when all we can see are their bones. 2.) You've got enough of a start on this one. 3.) No. You can only say that evolution has occurred when there is a shift in gene frequencies in a population. Applying better diet and medicine will make people healt...
by Khaiy
Fri Apr 21, 2006 4:51 pm
Forum: Evolution
Topic: Tree of life
Replies: 13
Views: 9918

No, evolution is still the best descriptor of the process, because the tree will still branch out more and more as time goes on from a common ancestor. The issue with current taxonomic diagrams is that they were originally based only on physical characteristics, which does not necessarily represent ...
by Khaiy
Fri Apr 21, 2006 4:42 pm
Forum: Genetics
Topic: diheterozygous and dihomozyous
Replies: 1
Views: 4172

In a dihybrid cross, you're looking at the inheritence of two genes. For example, let's say that the genes are A and B. You know that a heterozygote for one gene is Aa or Bb, and all that the "di" in front means is that both genes are heterozygous, or that both genes are homozygous (for a ...
by Khaiy
Thu Apr 20, 2006 8:20 pm
Forum: Genetics
Topic: monohybrid cross
Replies: 3
Views: 4944

Try drawing a Punnett square for it. A monohybrid cross would be set up like this: Each parent is a hybrid for the gene that you're looking at: Aa, for example. When you cross an Aa individual with another Aa individual, what would the results be? Assuming that this is a simple monhybrid cross, that...
by Khaiy
Thu Apr 20, 2006 8:12 pm
Forum: Zoology Discussion
Topic: mammals
Replies: 10
Views: 7784

I'm not 100% sure about dolphins, but whales do have hair, just not a thick coat like a lot of mammals. Dolphins might also have some very fine, and possibly vestigial hairs.

EDIT: Blast, beaten to it by Bio_Girl015!
by Khaiy
Thu Apr 20, 2006 8:11 pm
Forum: General Discussion
Topic: Immortality
Replies: 36
Views: 18662

Re: Immortality

Is immortality biologically possible? It is. Nope, I'm afraid not. As baikuza stated, eventually, the very elements in your body would break down. It would take a very long time, but eventually it would catch up with you (in the entire history of the earth, we've only gone through one half life of ...