2
votes
2answers
1k views

Why aren't animals diverse in phenotype? [duplicate]

I am not comparing a cat with leopard. I am just saying that we humans are all one type of creature and we are diverse (I am not saying we are class of mammals and phylum of etc and kingdom etc, ...
1
vote
1answer
94 views

Which came first in hominid evolution: language or bipedalism? [closed]

I suspect both language-use and upright-posture have anatomical consequences. So does the fossil record show which came first? NOTE: To the folks who marked this question "homework": This is ...
10
votes
1answer
4k views

On the genetics behind caste marriages

I am in India where it is typically a custom to marry within one's caste. Basically the caste system originated with roots in people's professions - Each of priests, carpenters, troupers, etc had a ...
1
vote
0answers
18 views

What would happen to a body in an astronaut suit over time if floating free? [duplicate]

I'm not sure if this is best in Biology or Physics, but on Earth we decay to skeletons and then eventually to dust. What would happen in space in a space suit?
2
votes
0answers
52 views

Cockroaches and magnetic fields

Aloha, I live in Hawaii working with sharks and their sensitivity to magnetism but here we also have large cockroaches. Has anyone worked with cockroaches and magnetism? I wonder if placing high ...
1
vote
1answer
108 views

Mode of Enzymatic Inhibition via R-Allele

The photo above shows the effects of the R allele of the pea shape gene on the synthesis of an enzyme that converts unbranched starch into branched starch. The r allele of this gene determines an ...
0
votes
1answer
179 views

Why do humans have eyebrows? [closed]

Why do humans have eyebrows? It seems that it isn't necessary but only humans have them, correct? So what is the use of them for humans? I hear that they protect our eyes. However, isn't that what ...
6
votes
1answer
260 views

Why are particular laser-related skin products not recommended for darker skin tones?

This is about products such as: The "Theradome" laser helmet (this claims to stimulate hair growth through lasers) Theradome™, a biomedical engineering company based in the Silicon Valley, is ...
1
vote
1answer
478 views

How to determine if this blood disorder is recessive or dominant?

This question is from "Concepts of Genetics," Klug & Cummings, 10e. "Thalassemia is an inherited anemic disorder in humans. Affected individuals exhibit either a minor anemia or a major anemia. ...
1
vote
1answer
40 views

The damage of cancer cells

I read about the molecular biology of cancer, and I have a mess on my head and a lot of questions.. . My primary question is- The damage of the cancer cells is in the dna sequence or in the gene ...
2
votes
1answer
44 views

Is it possible to estimate how much variation in common phenotypes is predicted by genetics?

Phenotypes such as; skin color, eye color, nose shape, lip size, limb proportions, and skull shape. Im trying to find a source for this quote. "If you ask what percentage of your genes is reflected ...
3
votes
1answer
123 views

Identification of unknown bagworm (Singapore)

This bagworm was found in Singapore (near McRitchie Reservoir) some time in June 2012. This is the plant from which the bagworms were obtained: A few examples of the bagworms: The bagworm when ...
4
votes
1answer
76 views

Statistics on energy consumption breakdown per biological functions across organisms?

Are there any statistics available on how much energy organisms use for each biological functions (i.e. something similar to the line of "Bacteria spend X% of energy on information processing, Y% for ...
2
votes
1answer
176 views

Gradualism vs. Punctuationalism

TLDR? Just read the bold bits! I started with Darwin's Origin of Species, and then read Dawkins's first three books The Selfish Gene, The Extended Phenotype, and The Blind watchmaker (I just started ...
1
vote
0answers
20 views

Question about clusters and populations [closed]

Whats the difference between a cluster and a population?...and do non africans cluster together? Examples European populations or the niger congo cluster.
8
votes
0answers
539 views

Evolutionary reasons why you cannot tickle yourself but masturbate

There are obviously good reasons that explain why you cannot tickle yourself (see e.g. here). This got me thinking why it is possible to masturbate... Wouldn't it make more sense to not being able to ...
2
votes
1answer
279 views

How can a brainless Cnidarian hunt and defend itself?

Cnidaria, such as jelly fish and sea anemones are radial symmetric en feature a simple body plan. One notable aspect is the lack of a brain. Hence, there is no central guiding structure, no mind or ...
2
votes
1answer
106 views

Plant tissue culture [closed]

Tissue culture means that cells are propagated and multiplied under controlled conditions. Suppose the following situations: a) A seed being is embedded in an Agar medium and germinated under ...
5
votes
2answers
509 views

Why do skin and nail go blue in cyanosis?

I have learned that Cyanosis presents with blue skin and nails. What is the reason for the blue coloration of the skin and nails? Why wont the skin and nails turn another color in the visible spectrum ...
0
votes
1answer
72 views

How much mass does a person lose in a day through breathing and perspiration?

Water and carbon are lost through perspiration and breathing. How much mass is lost in this way in a single day for a typical person?
1
vote
0answers
53 views

How to measure chemical elements in soil? [closed]

What sort of equipment would one need to ensure that plant soil contains the right concentration of the 13 mineral nutrients necessary for plant growth? As far I understand, it's vital that all the ...
2
votes
0answers
112 views

Why are riboswitches mostly present in bacteria and not in eukaryotes?

Riboswitches are a rather elegant way to regulate gene expression without any additional machinery. A small ligand binds to the mRNA and directly influences transcription or translation. Most of the ...
1
vote
0answers
46 views

Is there any tree or other plant that produces a new crop in fast cycles? [closed]

Is there any tree or other plant that produces a new crop in fast cycles? By fast I would mean something much more often than once or twice a year, like every month or every few weeks. What is the ...
2
votes
0answers
151 views

Can protein sample be made 2% Triton X-100 free?

The protein I am purifying needed an elution buffer with 2% Triton X-100. I formulated the elution buffer not keeping the CMC in mind. My goal is to make my protein sample triton free to check its ...
2
votes
3answers
509 views

True or false & fill in the blanks

A ribosome is where amino acids are linked together by peptide bonds. A virus is NOT considered prokaryotic because it does not have a membrane. The nucleotide ATP is one of the most used energy ...
7
votes
1answer
275 views

What is the limit of time resolution in fMRI?

I was reading about a few studies on estimating functional connectivity between brain areas using fMRI signals. However, as far as I know that fMRI has a very poor time resolution, roughly in the ...
5
votes
1answer
127 views

How to measure metabolic rates of microscopically small animals?

I want to measure metabolism rates in Tardigrades Metabolic rates will be assessed immediately following their exit from cryptobiosis (an animal dormant state). I know that oxygen levels is the ...
3
votes
0answers
42 views

What has to duplicate before cell enters M phase? [closed]

What has to duplicate before cell enters M phase? DNA histones centrosome mitochondria (any other organelles?) condensins (not sure?) have I forgotten anything? Thank you in advance!
2
votes
0answers
59 views

What species of Cerapoda lived during the Jurassic?

So far, I've found eleven species of Cerapoda that lived during the Jurassic period. Are there any other known species that I've missed? The eleven that I've found out about are: Agilisaurus ...
3
votes
2answers
277 views

Assessing probability from a pedigree

This isn't exactly homework but I'd like to treat it as such. I'm asked to find the probability that both (III: 2) and (III: 3) are carriers given that (II: 7) and (III: 1) exhibited the recessive ...
3
votes
0answers
43 views

What are the biological mechanisms of candy causing nausea?

As I sit here after eating too much chocolate, I wonder: What are the biological mechanisms behind eating too much candy candy causing nausea in a healthy individual? Is it a spike in blood sugar, ...
8
votes
1answer
161 views

Model for fluctuating selection

Is there any mathematical model to predict the behaviour and long-term consequence of counter-acting selection at different time scale? For example, let's consider the bi-allelic gene A, with alleles ...
1
vote
1answer
218 views

What is Mendelian Segregation and how is it related to the Hardy-Weinberg equilibrium?

I can't find the exact definition of Mendelian segregation. In addition, I am wondering how it is related to the Hardy-Weinberg equilibrium?
5
votes
3answers
1k views

How does vasoconstriction/vasodilation change blood pressure?

Background: I am coming at this question from an electrical engineering background, and I feel like I am missing certain assumptions that are going into the statement found in my physiology textbook, ...
3
votes
1answer
181 views

How to maximize lung oxygen intake?

What method of breathing provides a sudden surge of oxygen into the lungs filling it as full as possible in volume and density. Deep breaths? Shallow breaths? Breaths taken while bent over? Deep ...
0
votes
2answers
179 views

What is the name of the condition where no pacemaker cells are active in the heart for a short-time?

Assume that the heart is beating, but no pacemaker cells are working for at least 15 seconds. This would be a very long compensatory pause if extrasystole started it. There may be some low frequent ...
0
votes
1answer
76 views

Almost philosophical question about controlling a pest/plague

Once in a math congress someone presented a paper on a mathematical model used to predict the impact of certain measures that could be taken in order to control some pest/plague. A guy in the audience ...
2
votes
1answer
35 views

Are there any generic (not dependent on symptoms) ways to find parasite infections?

Are there any generic ways to determine if a person is infected with a parasite? With "generic ways" I mean ways that do not rely on symptoms caused by a particular parasite. Also I am mainly ...
1
vote
2answers
44 views

Why don't stem cell therapies use viruses?

Why don't stem cell therapies use a virus to deliver gene editing sequences to stem cells instead of the harvesting-transformation-transplant route. I thought it might be because of a lack of ...
0
votes
1answer
105 views

Which of these components has C-H and COOH groups [closed]

A) Amino acids and triglycerides that have a carbon-carbon double bond or B) proteins and fatty acids I think they ...
3
votes
3answers
314 views

How do we look inside the cell?

My sister is in 9th grade biology and her teacher avoided answering the question of how we actually study the inside of a cell. I haven't taken biology in a while but I'd like to give her an answer. ...
1
vote
1answer
192 views

Pituitary giants - is the fusing of growth plates dependent on amount of growth hormone in blood?

I wanted to ask a couple questions related to pituitary giants (people who are giants because of some anomaly, such as a tumor, in their pituitary gland). Some of these giants seem to keep growing ...
1
vote
0answers
100 views

Factors for sensitivity to electric shock

I'm frequently getting electric shocks in my office when touching things. I basically know why this happens and how to avoid it. Still I started to wonder what would be the best way to touch ...
1
vote
1answer
84 views

What is the biological basis for tiredness after eating? [duplicate]

I can sometimes feel quite drowsy after some "meals" (e.g. a cold cut & cheese sandwich with juice on the side) and less drowsy (or maybe less often) after others (such as a salad). This ...
3
votes
0answers
217 views

How to prevent e coli from clumping (for FACS)?

I'm performing FACS on e coli, but the cells are clumping together so each event is multiple cells. I ran a control where I had one flask of e coli expressing GFP, and one flask expressing RFP. Run ...
3
votes
1answer
61 views

Literature about putative epigenetic state changes in mammal sequences after cloning steps in Escherichia coli

I would like you to point me out some literature about putative epigenetic state changes in mouse/mammal sequences after cloning steps in Escherichia coli. This are the last search details I used in ...
6
votes
1answer
94 views

Is the eyes' movement discrete?

When tired and it was dark, I noticed that if I focused on a dim light source and moved my eyes fairly rapidly sideways, the resulting images that lingered for a short while were not smoothly blurred ...
2
votes
2answers
149 views

Parallels between pixelized image and the human retina

On Wikipedia it is explained that the human eye has a certain 'resolution'. Does this mean that the retinal image consists of pixels? If yes, what shape would these pixels have?
4
votes
1answer
302 views

If we change our breathing rate so easily, then what is the point of measuring it?

When we are self-conscious of our own breathing, its rate changes very easily. Therefore, if it changes so easily, what is the point in measuring it? Thank you for your time and effort
2
votes
0answers
48 views

Death Psychology [closed]

Why do we sympathize in general when we see something or someone dying even if we personally don't know it/them? Is there any species which sympathize with the death of its own species? Is there any ...

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