Q: Compare the dental formulae of humans and rats. What are the implications for the diets of both species?
A: It is evident that rats have no canines or premolars [because] rats do not tear flesh like humans do, because they do not have canines and premolars to assist them in doing so. Rats eat more lighter food as compared to humans.
Showing posts with label Dissections. Show all posts
Showing posts with label Dissections. Show all posts
Wednesday, November 11, 2009
Friday, November 6, 2009
Do you think they actually know what a rat is...?
Q: Compare the dental formulae of humans and rats. What are the implications for the diets of both species?
A: Only 2 carnivores per jaw on a rat and a diastema gab without teeth and 2 molars per side of a jaw. This suggests that rats have a limited diet (preferably meat) while human have a wide range of diets.
A: Only 2 carnivores per jaw on a rat and a diastema gab without teeth and 2 molars per side of a jaw. This suggests that rats have a limited diet (preferably meat) while human have a wide range of diets.
Thursday, November 5, 2009
What's worse? Their vicious temperament, or their poor diet?
Q: When comparing the dental formulae of a rat and a human, what features indicate a difference in the diet of the two species? What do these differences suggest about the diets of both species?
A: [The rats have]…one canine on each side and three molars on each side. The rat [therefore] uses canines to rip & tear the food & the molars to grind it. The ripping and tearing is for the meat that the rat eats & the grinding is for the corn it steals from farmers. We have incisors and premolars which are used for biting & chewing, [therefore] we have a diet with softer things such as vegetables etc.
A: [The rats have]…one canine on each side and three molars on each side. The rat [therefore] uses canines to rip & tear the food & the molars to grind it. The ripping and tearing is for the meat that the rat eats & the grinding is for the corn it steals from farmers. We have incisors and premolars which are used for biting & chewing, [therefore] we have a diet with softer things such as vegetables etc.
Monday, June 22, 2009
Snibble...?
Q: What teeth of the rat are visible in the provided diagram and how many pairs of these teeth occur in the upper jaw of the rat?
A: upper front teeth: only one pair (2). *He uses it to cut off vegetables and snibble on paper or anything chewable.
A: upper front teeth: only one pair (2). *He uses it to cut off vegetables and snibble on paper or anything chewable.
Tuesday, June 16, 2009
That's gotta be a nasty surprise...!
Q: What is the sex of this rat? Name two structures visible in your specimen that support your answer.
A: Female, ovaries, horned vagina.
A: Female, ovaries, horned vagina.
Monday, June 1, 2009
The Croc/elephant shrew/alien monster thingy.
I dug up This little gem from a while back. I think I sent it to Luke or Helen. In any case it is one of my favourite practical dissection drawings. (it's supposed to be a crocodile btw)
Click to Enlarge
Click to Enlarge
I looked around for a nice picture of a croc dissection to make a comparison. Alas, couldn't find one.
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