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Anybody a biology master?

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.travis.
Posts: 1737 - Karma: 46
Im in bio 101 and have a take home test to complete and could really use some help. Anyone killer in this subject?
Oct 28 2009 4:04PM
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ClownPrince
Posts: 500 - Karma: 10
I don't know about biology "master", but I can try...
Oct 28 2009 4:08PM
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_CC_
Posts: 3890 - Karma: 747
you talkin college or hs?
Oct 28 2009 4:10PM
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.travis.
Posts: 1737 - Karma: 46
alright, some questions i need help with are
1 the alleles of which parent, regardless of genotype, determine color blindness in a son?
2 the trait is autosomal recessive and the results of the cross are 1:1. what are the genotypes of the parents?
3. in what ways to the kidney aid in homeostasis?

i have a bunch, and tried google but couldnt really make sense of most of it, bio is not my strong point to say the least. any help is much appricatied



Oct 28 2009 4:14PM
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2_fadez
Posts: 7780 - Karma: 4,180
for the first question, the answer is the mother because the trait is carried on the X chromosome. since the boy has only one X and one Y, the Y comes from the father, thus the deformed X chromosome with the color blindness trait comes from the mother
Oct 28 2009 4:17PM
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_CC_
Posts: 3890 - Karma: 747
1. the father, color blindness is a sex linked trait
2. 1 heterozygous parent and 1 homozygous recessive
3. removal of toxin? anatomy is not my strong point....
Oct 28 2009 4:19PM
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2_fadez
Posts: 7780 - Karma: 4,180
for the second one, i don't really understand when its says 1:1, but it might mean that both parents are recessive: tt and tt
Oct 28 2009 4:19PM
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ClownPrince
Posts: 500 - Karma: 10
1 - the mother's X chromosome always determines color blindness in a son (color blindness is an x-linked recessive trait, sons get only a Y chromosome from father).

2 - One parent must be heterozygous, the other one must be homozygous recessive. This gives two heterozygous (dominant phenotype) and two homozygous recessive progeny out of every 4 total (a 1:1 ratio).  For example, Aa X aa = 1/2 Aa, 1/2 aa (you can set up that Punnett square if you need to).

Can't give you much on 3, haven't taken a class on that in a few years. It probably has something to do with nephrons and stuff, but honestly I can't remember.
Oct 28 2009 4:21PM
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idontactuallyski
Posts: 1320 - Karma: 19
i always thought it was the father, but i guess not.
Oct 28 2009 4:22PM
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KingofInterwebz
Posts: 152 - Karma: 9
same
Oct 28 2009 4:23PM
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ClownPrince
Posts: 500 - Karma: 10
It's definitely the mother in color blindness. Some traits are Y-linked, meaning they come from the father, but not that one.

Anything else? I'm bored.
Oct 28 2009 4:27PM
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.travis.
Posts: 1737 - Karma: 46
Thank you guys so much, i wish i could put all your karmas to like 1000000. I just have a few more then i will let it die, im sure nobody wants to do homework all night.

4. what is a karyotype

5. what type of protein speeds up chemical reactions?

6. a drug inhibits the uptake or reabsorption of water by the distal convoluted tubules. what effect would this drug have on urine output, urine concentration, blood pressure, blood volume, and the concentration of blood

There that would be sick to get some help on those. once again thank you all so much
Oct 28 2009 4:30PM
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2_fadez
Posts: 7780 - Karma: 4,180
5 is an enzyme
Oct 28 2009 4:32PM
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ClownPrince
Posts: 500 - Karma: 10
4 - a karyotype is a chromosome map/picture, sort-of like an x-ray for chromosomes if I remember correctly.

5 - enzyme

6 - again, this is nephrons and kidney stuff. My mind's real fuzzy on this, if I gave you an answer it would probably be mostly wrong.



Oct 28 2009 4:35PM
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Bonham18
Posts: 8 - Karma: 10
4. what is a karyotype

5. what type of protein speeds up chemical reactions?

6. a drug inhibits the uptake or reabsorption of water by the distal convoluted tubules. what effect would this drug have on urine output, urine concentration, blood pressure, blood volume, and the concentration of blood

There that would be sick to get some help on those. once again thank you all so much

5 is an enzyme
6) urine output would decrease, concentration would increase, dont know about the other ones
Oct 28 2009 4:36PM
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frosted_flakes
Posts: 1200 - Karma: 1,256

4. you're not very good at biology, but anyways its the appearance or effect of a gene combination

5. if this is enzymes then you really are dumb

take notes next time

Oct 28 2009 4:38PM
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frosted_flakes
Posts: 1200 - Karma: 1,256
-effect
Oct 28 2009 4:39PM
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RudyGarmisch
Posts: 25443 - Karma: 13,844
http://en.wikipedia.org/wiki/Karyotype

An enzyme.

As for the 6, been a while since I did anything with the biology of the kidney, I frankly forget. I would guess that the body would compensate by outputting more water in order to rid the body of the salts, since intake is lower. Urine concentration would go down, but bp, bv, [b], i have no idea.
Oct 28 2009 4:40PM
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CANNON^
Posts: 1609 - Karma: 23

im in AP bio so it might help

6. i would say that the urine output would increase, the concentration of urine would increase, blood pressure would increse, idk about the blood volume and the concentration of blood might decrease.

not sure about them but its better than nothing

Oct 28 2009 4:40PM
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ZavierV
Posts: 5077 - Karma: 100
6. a drug inhibits the uptake or reabsorption of water by the distal convoluted tubules. what effect would this drug have on urine output, urine concentration, blood pressure, blood volume, and the concentration of blood


If the uptake/ reabsorption of water is compromised, then the loop of henle will not be able to reabsorb water for re-uptake by the blood. This would result in more dilute urine (remember it's the concentration of solute in solution that gives concentration; more water & same amount of solute = less concentrated solution)
If uptake/reabsorption is compromised, then as stated above, urine output would be greater, otherwise there would be no effect on concentration.

If water is not reabsorbed and returned to the blood, then blood volume would decrease as would blood pressure by the aforementioned principles.

Concentration of blood would increase minimally.

Oct 28 2009 6:46PM
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