0
votes
1answer
9 views

Hardy-Weinberg Equilibrium Question

I have four questions concerning H-W Equilibrium: (i) In a population of mice, the presence of black spots is the result of a homozygous recessive condition. If the frequency of the allele for this ...
0
votes
0answers
3 views

Viral DNA Fragment or Embedded?

When a virus starts making their mutated DNA after taking over cells, will the mutated DNA be in a fragment or will it be embedded in some longer, overarching strand of DNA. Another words, say a ...
3
votes
1answer
44 views
+50

What neuro-motor diseases cause the lower esophageal sphincter (LES) to malfunction?

Please note: This question is neither homework nor seeking medical advice. I'm simply asking for a factual, objective, biological explanation of the various neuro-motor diseases/illnesses that can act ...
0
votes
0answers
8 views

Evolution of a Population

Scientists observe a newly established population of sexually reproducing plants growing on the shore of a small island. An observable trait of the plant has two possible phenotypes. It is determined ...
1
vote
0answers
16 views

How do we know Denisovans had 46 Chromosomes

What allows sequencers to conclude that Denisovans had 46 chromosomes rather than merely knowing Denisovans had the crossover material arranged in 48 or say 44 chromosomes? See ...
2
votes
2answers
53 views

Is there a way to prevent an HIV infection after exposure to HIV infected Blood?

If a person is accidentally injected with blood from an HIV+ person, is there a treatment option that can keep the person from developing an HIV infection?
37
votes
4answers
4k views

Why is polyploidy lethal for some organisms while for others is not?

Polyploidy is the multiplication of number of chromosomal sets from 2n to 3n (triploidy), 4n (tetraploidy) and so on. It is quite common in plants, for example many crops like wheat or Brassica forms. ...
1
vote
2answers
14 views

Is it possible to amplify every single piece of DNA through PCR?

Is there a way to perform non-specific PCR amplification for the purpose of amplifying every piece of DNA present?
0
votes
2answers
33 views

Junk DNA and “random” mutations

I'm somewhat irritated by "mutation" generally being described as a fully random factor in evolution: pure randomness does not seem like something that can survive in a long evolutionary process. And ...
1
vote
1answer
24 views

What were the symptoms of Phineas Gage after suffering his brain injury?

Phineas Gage was a construction worker who suffered a head injury due to an explosion at a construction site. A metal rod was pushed up his cheek and through his head. I have heard he demonstrated ...
1
vote
0answers
9 views

PAGE gel in EtBr

I have been using TBE-PAGE gel to see small fragments of DNA by post-staining that means gel is stained with EtBr after electrophoresis. Someone told me that you can add EtBr before polymerizing ...
2
votes
0answers
8 views

What is the distribution of the number of heterozygotes in finite populations?

Consider a bi-allelic locus with alleles A and a. We denote the frequency of the A allele by ...
1
vote
0answers
11 views

Link together all alike DNA sequences

Is it possible to take a DNA solution and link together every alike fragment of DNA in the solution?
0
votes
0answers
3 views

When is pain induced on humans when object contacts it?

Normally, when something touch you, you won't feel pain. With a great force "touching" you, you will feel pain. However, if something that is spiky makes contact with you, you will feel pain. So, how ...
7
votes
2answers
2k views

Does one parent transmit more DNA to the offspring than the other one?

Does one parent transmit more DNA to the offspring than the other one? Or do both parents always transmit the same amount of genetic material to their offspring? In other words, can a baby be ...
0
votes
0answers
5 views

Extending a small fragment of DNA

Is there a way to extend a small fragment of DNA, say 150 bp, by making copies of itself and attaching each copy of that small fragment to the end of that 150 bp sequence? For example, I want a 1kbp+ ...
3
votes
1answer
20 views

What species is this?

We found this on a beach in the Bay of Lannion, Brittany, France. What is it? About 6 cm long.
3
votes
2answers
96 views

Why does all life use the same macromolecules in their genetic code?

There is no biochemical constraint of any sort, so why doesn't some other code work? Why is it specifically RNA/DNA?
0
votes
0answers
7 views

White blood cell transfusion

Some patient who have low White blood cells need WBC Transfusion do resist infections. What is interesting, doesn't transfused WBCs cause temporary autoimmune disease ? Like recognising patients ...
0
votes
0answers
9 views

Whole Genome Sequencing and B Chromosomes

Do whole genome sequencing techniques detect B chromosomes if such chromosomes are present? My understanding is as follows: How the DNA material in a B Chromosome is mapped depends on the reference ...
3
votes
0answers
8 views

What techniques can be used to link environmental conditions to crop yield?

Im interested in how we can determine what are the optimal conditions for crops and how deviations from these optimal conditions affect yield. In the literature I have found two main approaches and I ...
6
votes
4answers
108 views

Are all pathogens parasites?

If parasites are organisms that feed on other living organisms, then aren't all pathogens parasites? I've emphasised on 'feed' because I guess the pathogens just eat us (i.e. take nutrients to ...
0
votes
2answers
19 views

Whole Genome Sequencing and Chromosome Counts

In general, do standard whole genome sequencing techniques rely more on known chromosome counts, independently arrive at chromosome counts, and/or not directly address issues such as base number, ...
1
vote
0answers
9 views

Role of microvilli in cell volume regulation

Does the presence of microvilli on a cell's surface ensure that it's more resistant to cell swelling or lysis in a hypotonic solution, as compared to a normal cell?
4
votes
2answers
70 views

Can axons act as receptors?

In all histology books, it is stated that all sensory nerve endings (receptors) consist of dendrites that translate physical stimuli from the environment into neural signals. However, several sensory ...
0
votes
0answers
5 views

Why is dopamine considered both an excitatory and Inhibitory neurotransmitter? [duplicate]

To me it seems the one allows flow and the other prevents flow. How does dopamine do both?
2
votes
2answers
19 views

Chemotherapy - Hair loss

Chemotherapy kills cancer cells by targeting rapidly growing cells. That is why patients are loosing hair as well. My question is, why chemo related hair loss is temporary ? The docs say it is ...
4
votes
2answers
226 views

Why do we think chronic inflammation can cause cancer?

Why do we think chronic inflammation can cause cancer? I know the pathway is not fully understood, but what makes scientists believe that inflammation causes cancer?
1
vote
0answers
36 views

Differing Flow Cytometry Genome Sizes and Sexual Mating Implies Differing Chromosome Counts

Do the fundamental principles of genetics strongly suggest the following is a derived conjecture? If 2 flowering plant species A and B have widely differing genome size (at a minimum a 50% ...
0
votes
0answers
9 views

Why I don't feel pain when I press the skin on my knee and elbow?

Does the muscle on our knee and elbow have some speciality ? Why are we unable to feel any sort of pain when I pinch it ? I also did it with my Mom and Dad and result was same .
1
vote
2answers
27 views

How do neurons recieve ions needed for creating electical pulse?

I really wonder what is responsible for getting ions into the brain and into the neurons for creating electrical potentials - how do ions get from our digestive system to neurons. Or are the ions just ...
4
votes
3answers
515 views

Why is mRNA needed in the Protein translation?

The original question was to predict the basic requirements for information storage. Then the discussion moved to why is it necessary to include mRNA in the protein translation process. Why can't ...
0
votes
0answers
8 views

How plants absorb water? [on hold]

I would like to know how plants absorb water for their roots. ( I mean the way they do it ).
8
votes
3answers
107 views

Do biological phenomena follow Gaussian statistics?

I have recently entered the life sciences (from physics). I am concerned about the use of p values in the life sciences literature. For example, in this article, they test 9 - 12 rats in a control ...
0
votes
1answer
18 views

What are the changes to semen if it is put stationarily in the atmosphere for a period of time?

If I put it in a test tube for, say a week, what are the physical and chemical changes? In addition, will the fructose inside be lost or broken down?
-1
votes
1answer
24 views

During Orgasm, Do females ejaculates like males? [on hold]

Acc to Bio-Science, males get ejaculates when they reach orgasm, so what about females? do they get ejaculation like males?
3
votes
1answer
269 views

Parasitism and mimicry

I was reading this article which states this: Classical Batesian mimicry, in which an undefended mimic evolves to look like a toxic model, is a parasitic relationship in which the mimic gains ...
0
votes
2answers
70 views

Complexity in creating transgenic animals (e.g., mice)

Many papers I have seen describing transgenic rodent models (and presumably applicable to other model organisms) involve the knock-in, or modification to, a single gene, possibly two genes. With ...
13
votes
1answer
375 views

Solubility of DNA in water

This would seem to be an easy to answer question, but I was unable to find an answer (in g/L) for generic double-stranded DNA or plasmid neither on Google nor on BioNumbers. I would expect the ...
3
votes
0answers
57 views

Why are lips covered with specialized skin?

I found out some interesting facts while studying our lips: They are covered in glabrous skin, while most of the skin surface is hairy; The outermost layer (stratum corneum) of the skin is far ...
2
votes
0answers
68 views

Can flow cytometric analysis differentiate between a parent contributing longer chromosomes versus multiple smaller chromosomes? [on hold]

Given 2 closely related flowering plant species A and B in a natural contact zone where the number of chromosomes is unknown for both species assume using flow cytometry using PI staining we know the ...
0
votes
0answers
22 views

What the definition of a flanking residue? [on hold]

What the definition of a flanking residue? How do you define whether an amino acid is flanking or not? What are the environmental or physiochemical conditions in which a residue is considered to be ...
1
vote
0answers
30 views

Can our eyes see faster? [on hold]

There are some animals that react faster than normal rate (like flies, etc). I guess it's because they can see faster than other animals and humans, as if time passes slower for them. I think some ...
3
votes
2answers
302 views

Can dietary monosodium glutamate intake induce restlestness?

The question is all in the title. More context: I like phở soup. I have noticed that I get restless after eating the phở soup at some restaurants. The effects are similar to the ones resulting from ...
10
votes
1answer
260 views

Is it a limitation of the eyes, or the brain, that we can't see a moving bullet?

Are the photoreceptors in our eyes not fast enough to register the fast moving bullet, or is the brain not powerful enough to make sense of something happening that fast?
-3
votes
0answers
28 views

Why not frozen evolution? [on hold]

I'm not sure if you have heard of it. It is a theory proposed by the best Czech evolutionary biologist (even though it disproves the selfish gene and darwinism for sexual species :), but it is not ...
1
vote
1answer
14 views

How do roots absorb water instead of presence of waxy - material suberin in the form of casparian strips on the wall of endodermis?

I found that in the endodermis, the tangential and radial walls have deposition of the waxy, and hence water-impermeable, material suberin in the form of casparian strips. The endodermis comes before ...
1
vote
1answer
22 views

Are multi-chain proteins synthesized as one biological unit?

Are multi-chain proteins (especially homo/hetero-dimers) synthesized together as one overall unit or are they separate monomers which bind together at some point after synthesis, and are there any ...
0
votes
0answers
22 views

If humans are 10cm taller than 200 years ago, then how can it be that we are “not much different” from humans 70000 years ago? [on hold]

According to Yuval Noah Harari in his book "Sapiens: A Brief History of Humankind" we today are not much different from the post-cognitive-revolution Homo Sapiens which lived 70000 years ago. But then ...
2
votes
1answer
34 views

Metabolism priority in poisonings

Let's assume we have two toxins - one of which is routinely metabolized by the liver, and the other is new to the organism (consider for example alcohol in a heavy drinker and any other drug that is ...

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