# Hw sucks..need help (math/genetics) **URL:** \ **Category:** NYSpeed Off Topic\ **Created:** [September 6, 2006, 3:58pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068 "2006-09-06T15:58:56Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![DJ\_X-StatiK](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dj_x-statik/32/7579_2.png) [@DJ\_X-StatiK](https://forums.speedlife.net/u/DJ_X-StatiK)\ **Post date:** [September 6, 2006, 3:58pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/1 "2006-09-06T15:58:56Z")
ok…so im taking this online biology class…im almost done with it and it completely sucks…im about to rip my hair out cuz ive been reading all day…and i cant even seem to do this right now even though ive been learning more difficult material all day… i suck and really dont enjoy doing probability…anyone bored and could possibly help me out? thanks… 😃 ## when all else fails…ask NYSpeed… :lol: 1. (10 points) Calculate the probabilities of the events described below. Be sure to show your work, and do not use Punnett squares. a. Four normal pennies are tossed simultaneously. What is the probability that all four will come up heads? b. What is the probability that the same four coins will come up either all heads or all tails? c. In guinea pigs, black coat color (B) is dominant over white coat color (b). When a true breeding black guinea pig is crossed to a true breeding white guinea pig, what fraction of their progeny will be black? d. If two heterozygous black guinea pigs are crossed, what fraction of their progeny will be black? e. The lack of pigmentation (albinism) in humans is the result of a recessive allele (a) and normal pigmentation is the result of its dominant allele (A). Two normal parents have an albino child. Determine the probability that the next child is albino. f. The genotypes of two individuals in a tetrahybrid cross are AABbCCDd and AabbccDD. What fraction of their offspring would be heterozygous for all four traits? (Assume independent assortment for all four traits.) ---
**Author:** ![Jack](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jack/32/7613_2.png) [@Jack](https://forums.speedlife.net/u/Jack)\ **Post date:** [September 6, 2006, 4:05pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/2 "2006-09-06T16:05:44Z")
thats shit I learned in middle school. Haven’t used it sense. Never will. Sorry! ---
**Author:** ![DJ\_X-StatiK](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dj_x-statik/32/7579_2.png) [@DJ\_X-StatiK](https://forums.speedlife.net/u/DJ_X-StatiK)\ **Post date:** [September 6, 2006, 4:08pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/3 "2006-09-06T16:08:47Z")
awww boo thanks anyways jack…you got my hopes up when i saw someone replied 😛 BAH! ---
**Author:** ![Joe](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/joe/32/7219_2.png) [@Joe](https://forums.speedlife.net/u/Joe)\ **Post date:** [September 6, 2006, 4:41pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/4 "2006-09-06T16:41:57Z")
a. 1/16 b. 1/8 c. 75% d. 75% e. 25% f. i stopped reading this looks like too much effort ---
**Author:** ![boardjnky4](https://avatars.discourse-cdn.com/v4/letter/b/96bed5/32.png) [@boardjnky4](https://forums.speedlife.net/u/boardjnky4)\ **Post date:** [September 6, 2006, 4:44pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/5 "2006-09-06T16:44:08Z")
yeah those 1st two were too easy. ---
**Author:** ![DJ\_X-StatiK](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dj_x-statik/32/7579_2.png) [@DJ\_X-StatiK](https://forums.speedlife.net/u/DJ_X-StatiK)\ **Post date:** [September 6, 2006, 4:56pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/6 "2006-09-06T16:56:07Z")
## awesome! thank you so much! 😃 what about? 2. (20 points) The absorption spectra from pigments extracted from two different types of plants A and B have been determined. The absorption data are shown below, where high, medium and low refer to the amount of light that is absorbed by the plant pigments. Absorbance Wavelength of light Plant A Plant B 350 nm low medium 400 nm (violet) med med-high 450 nm (blue) high med-high 500 nm (green) low h igh 550 nm (green) low med-high 600 nm (yellow) med med 650 nm (orange) high low 700 nm (red) med-low high a. What color is each plant? Explain. b. Leaves from each of these plants are each placed in a closed system container that has a small opening through which one can measure photosynthesis-derived oxygen production. What will the results be for each plant if light only in the 650 nm range is supplied? 500 nm range? 450 nm range? Explain. (Hint, the results would be data for action spectra.) 😃 😃 😃 ---
**Author:** ![lx50](https://avatars.discourse-cdn.com/v4/letter/l/ccd318/32.png) [@lx50](https://forums.speedlife.net/u/lx50)\ **Post date:** [September 6, 2006, 5:22pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/7 "2006-09-06T17:22:17Z")
I think C is 100% if you do the square all 4 come out Bb ---
**Author:** ![lx50](https://avatars.discourse-cdn.com/v4/letter/l/ccd318/32.png) [@lx50](https://forums.speedlife.net/u/lx50)\ **Post date:** [September 6, 2006, 5:52pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/8 "2006-09-06T17:52:00Z")
I would think plant A is green… since it is not absorbing much of that color it must be reflecting it right? and plant B is yellowish orange (based on the same logic) For the second part I think the higher the absorbtion the higher the rate of photosynthesis. 650- plant A high photo plant B low photo 500- A low B- high 450- A high B-high but not as high as A ---
**Author:** ![DJ\_X-StatiK](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dj_x-statik/32/7579_2.png) [@DJ\_X-StatiK](https://forums.speedlife.net/u/DJ_X-StatiK)\ **Post date:** [September 6, 2006, 6:06pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/9 "2006-09-06T18:06:34Z")
thanks a ton! 😃 muchly appreciated. ---
**Author:** ![87FOXGT](https://avatars.discourse-cdn.com/v4/letter/8/ecd19e/32.png) [@87FOXGT](https://forums.speedlife.net/u/87FOXGT)\ **Post date:** [September 6, 2006, 6:11pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/10 "2006-09-06T18:11:23Z")
ha ha sucks to be you 😃 jk dont give me anotehr black eye 😛 ---
**Author:** ![DJ\_X-StatiK](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dj_x-statik/32/7579_2.png) [@DJ\_X-StatiK](https://forums.speedlife.net/u/DJ_X-StatiK)\ **Post date:** [September 6, 2006, 6:25pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/11 "2006-09-06T18:25:09Z")
any takers on these? 😃 kthanksyourockplease! 😉 1. (20 points) Determine whether the following statements are true or false. If false, briefly explain why. a. Due to light-driven electron transport in the chloroplast, the thylakoid space is more acidic than the stroma. True False (Why?) b. Both C4 and CAM plants minimize photorespiration by bypassing the use of rubisco in the first step of carbon fixation. True False (Why?) c. Cyclic photophosphorylation involves both photosystems I and II, and results in the production of NADPH, O2, and ATP. True False (Why?) d. The Calvin cycle enzymes are embedded in the thylakoid membrane of the chloroplast. True False (Why?) e. During metaphase I of meiosis, tetrads (pairs of homologous chromosomes) align in random order at the metaphase plate. True False (Why?) f. During metaphase of mitosis, tetrads (pairs of homologous chromosomes) align in random order at the metaphase plate. True False (Why?) g. The cell cycle refers to the ordered sequence of events (G1, S, G2, and M phases) in the life of a dividing cell. True False (Why?) h. If a gene is located on the X or Y chromosome it must encode a protein that directly contributes to sex determination. True False (Why?) these were the last ones…promise… 🙂 ---
**Author:** ![brent\_strong](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/brent_strong/32/7203_2.png) [@brent\_strong](https://forums.speedlife.net/u/brent_strong)\ **Post date:** [September 6, 2006, 6:31pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/12 "2006-09-06T18:31:26Z")
e. f. g. true h. false pretty sure on those. if no one else answers the rest, ill take a shot. ---
**Author:** ![FightinMike](https://avatars.discourse-cdn.com/v4/letter/f/7bcc69/32.png) [@FightinMike](https://forums.speedlife.net/u/FightinMike)\ **Post date:** [September 6, 2006, 7:50pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/13 "2006-09-06T19:50:33Z")
Start asking some math theory I feel so left out. 😢 ---
**Author:** ![brent\_strong](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/brent_strong/32/7203_2.png) [@brent\_strong](https://forums.speedlife.net/u/brent_strong)\ **Post date:** [September 7, 2006, 2:27pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/14 "2006-09-07T14:27:28Z")
Wanna talk Markov chains? Or HMMs? ---
**Author:** ![DJ\_X-StatiK](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/dj_x-statik/32/7579_2.png) [@DJ\_X-StatiK](https://forums.speedlife.net/u/DJ_X-StatiK)\ **Post date:** [September 7, 2006, 3:17pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/15 "2006-09-07T15:17:45Z")
i got them and sent them in already…thanks guys! 🙂 ---
**Author:** ![JEG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/jeg/32/7246_2.png) [@JEG](https://forums.speedlife.net/u/JEG)\ **Post date:** [September 7, 2006, 3:21pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/16 "2006-09-07T15:21:30Z")
With the Black/white dominance one, they would all be black. If the black one is dominant over white, then all the offspring will be shades of black. ---
**Author:** ![brent\_strong](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/brent_strong/32/7203_2.png) [@brent\_strong](https://forums.speedlife.net/u/brent_strong)\ **Post date:** [September 7, 2006, 3:30pm UTC](https://forums.speedlife.net/t/hw-sucks-need-help-math-genetics/17068/17 "2006-09-07T15:30:16Z")
Shades of color with black/white would only come into play is in incomplete dominance. Using simple Mendelian dominance, there would only be white and black. C. 100%, breeding a homozygous dominant with a homozygous recessive D. 75%, breeding two heterozygotes