Biology - March 2007

In tomatoes, red fruit color is dominant to yellow. Suppose a tomato plant homozygous for red is crossed with one homozygous for yellow. Determine the genotype and phenotype of a) F1; b) F2 ; c) the offspring of a cross of F1 back to red parent ; d) the offspring of cross of F1 back to yellow parent

2007-03-29 03:46:31 · 4 answers · asked by Anonymous

In garden peas, tall stem T is dominant over short stem t and green pods G are dominant over yellow pods g). Suppose a homozygous short green plant is crossed with homozygous tall yellow.

2007-03-29 03:42:56 · 2 answers · asked by Anonymous

I have been thinking why lives are almost all physically symmetrical? For example, mammals appear to be symmetrical - right side of body is identical with the left side of body.

2007-03-29 02:42:09 · 3 answers · asked by Shan 2

2007-03-29 01:54:02 · 7 answers · asked by Anonymous

Has the development of the human species somehow blocked other species from evolving along a similar evolutionary path?

2007-03-29 01:18:14 · 16 answers · asked by Anonymous

Next week, I have test to do with about human body and cells!
Please give me any information about this!

2007-03-29 00:40:23 · 8 answers · asked by (_´Д｀)ノ まともに はじめなさいよ!(´∀｀）♪ 3

2007-03-28 23:32:21 · 4 answers · asked by Anonymous

2007-03-28 22:45:31 · 5 answers · asked by whiteknite_1 1

and why dont people grow wings when they existed!!!!

2007-03-28 21:38:38 · 8 answers · asked by Bluey306 2

In nasturtiums, double flowers(D) are dominant over singled flowers(d). Two double-flowered plants when crossed produce 17 double-flowered plants and 6 single flowered ones.

what are the genotypes of the parents?

2007-03-28 21:23:02 · 5 answers · asked by Anonymous

2007-03-28 19:39:46 · 4 answers · asked by Anonymous

2007-03-28 18:44:50 · 3 answers · asked by yeng_pad p 1

2007-03-28 18:21:51 · 6 answers · asked by boot 2

2007-03-28 18:08:16 · 6 answers · asked by boot 2

Alright, I'm doing my biology homework, procrastinating really and it asks to trace the blood through heart and body through 18 paths 1.vena cava (inferior vena cava?)2. right atrium 3. tricuspid valve 4. right ventricle 5.pulmonary semilunar valve (6? pulmonary trunk?)6 pulmonary arteries 7. capillaries in lung 8. pulmonary veins 9. left atrium 10. bicuspid valve 11. left ventricle 12(under septum)12. aortice smilunar valve 13. aorta
I can't get 18! Would it be correct to assume the (?) as numbers or is that stretching it? What am I missing?!?

2007-03-28 17:56:24 · 6 answers · asked by Gone2PickApples 2

i'm so stupid i was making dinner and i put potatoe peel into the drain and now it's backflowing. What should i do. I looked at a couple websites and they all say use baking soda. I dont have any baking soda. HELP!!! PLEASE HURRY!!!!

2007-03-28 17:49:35 · 6 answers · asked by Stephanie B 1

2007-03-28 17:09:32 · 5 answers · asked by R.I.A 30 1

2007-03-28 17:06:33 · 2 answers · asked by Hang 3

Karen and Steve each have a sibling with sickle cell disease. Neither Karen nor Steve nor any of their parents have the disease, and none of them have been tested to reveal the sickle cell trait. Based on this incomplete information, calculate the probability that if this couple has a child, the child will have sickle cell disease.

The answer they give in the back of my book is 1/9 but my question is WHY???

2007-03-28 16:59:05 · 4 answers · asked by sam 2

2007-03-28 16:56:30 · 3 answers · asked by Anonymous

2007-03-28 16:32:56 · 6 answers · asked by Anonymous

2007-03-28 16:10:44 · 8 answers · asked by Smiley :D 1

Can anyone tell me the amount or percentage of Sodium chloride (NaCl) in animal cells, particularly human cells?

2007-03-28 16:03:25 · 4 answers · asked by Anonymous

My findings could be useful in the "real world" in case anyone
ever leaves their milk out. Often times, little children leave
their bottles out or leave their milk sitting on the table
because they didn't want to drink it. If parents knows when
their child's milk was first put out, then they could
potentially save their child's life or at least prevent them
from getting sick due to food poisoning.
or
My answer could be useful in the real life in case anyone leaves their milk out. Sometimes, little kids leave their bottles out or leave their milk sitting on the table because they didn't want to drink it. If parents knew when their kid's milk was first put out, then they eventually start save their kid's life or at least keeping them from getting sick thanks to food poisoning.

or your own plz tell me i need to know.

2007-03-28 15:59:48 · 2 answers · asked by KLP 1

a. an anabolic steroid
b. a DNA helix
c. RNA nucleotides
d. an amino acid w/three phosphate groups attached
e. a phospholipd

2007-03-28 15:46:48 · 8 answers · asked by !*! 2

My hypothesis for a lab report was that tabacco and coffee both increase the heart rate but the results show that they both decrease the heart rate. How can this be explained? Why do most facts explain that they increase the rate? PLZ HELP THX!

2007-03-28 15:43:47 · 6 answers · asked by aya.face 1

What structure is involved with the transport within cytoplasm

ER? or Microtubules?

2007-03-28 15:43:31 · 4 answers · asked by Anonymous

And what are the three kinds of joints?

2007-03-28 15:42:07 · 8 answers · asked by Anonymous

The theory of biological evolution is based on change in the offspring of an organism either through combinations of traits inherited from the parent(s) or by mutation during reproduction. For the necessary number of changes to occur to progress from combinations of reproducing molecules to modern humans a certain number of generations must have occurred. For single celled life, generations occur rapidly but for more advanced organisms, there are far fewer generations and thus less opportunity for change. Throw in time for the Earth to cool, global catastrophes such as volcanism and asteroid and comet collisions, to cause rates of change to vary, and an evolutionary model could be constructed. Has this ever been done, and if so, what did it show? How many generations would be required for us to have evolved and has the Earth been in existence long enough for that many generations to have occurred?

2007-03-28 15:36:53 · 5 answers · asked by Zefram 2

prezygoitc barriers, postzygoitc barriers, geographical barriers

2007-03-28 15:18:16 · 1 answers · asked by Anonymous