Questions tagged [genetics]

Genetics is the branch of biology that deals with the transmission and variation of inherited characteristics.

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Did the eugenics program in Nazi Germany have a measurable effect? [closed]

Did the killing or sterilisation of people considered as living a "life unworthy of life" in Nazi Germany have any measurable effect on the "average health" of Germany? Is there any statistical ...
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Is most of the human genome functionless “junk DNA”?

In January 2012, David Icke published a book (ISBN: 9780955997334) entitled “Remember where you are and where you come from” in which he challenged what he claimed to be the view of mainstream science ...
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1answer
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Inheritance of partly genetic conditions

Suppose Anne has a condition like OCD, that has a significant genetic component. Neither of Anne's parents have OCD, though. Does this mean that each of Anne's OCD genes were carried by at least one ...
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2answers
81 views

How do transgenic transformations cause off-target phenotypes?

I read that transgene insertions can cause off-target mutations that result in a phenotype being overly ascribed to the transgene, e.g. the increase of lifespan being ascribed to Sir2 overexpression (...
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0answers
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Regulation of LBD33 genes Arabidopsis. If LBD 33 gene is up-regulated by auxin then why does expression decrease when increasing auxin concentration?

I have a question regarding the regulation of lateral boundary domain genes in Arabidopsis (specifically LBD33). I am an undergraduate student trying to understand the results of a lab where I measure ...
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1answer
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Heterochromatin v Euchromatin. Which is more abundant?

So I was just reading that whether heterochromatin or euchromatin is more abundant in a particular human cell depends on how active that cell is. But considering that most of the 25,000 or so genes in ...
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6answers
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Difference between genetic engineering and synthetic biology

I've recently seen the term synthetic biology being used to describe research involving genetic modification of organisms. What is the difference between synthetic biology and genetic engineering? Is ...
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1answer
36 views

What does (G+) (G++) in terms of male mutation rate and male-heterogametic XY-system?

What's the expression for $\alpha_m$ in case of male-heterogametic XY systems (G+)? Derive the corresponding $\alpha_m$ expression of for (sic) male-heterogametic XY systems (G++) I have ...
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1answer
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Genetics independent assortment?

As indicated in this question, what do you think is is the best explanation for the observed progeny, is it because distance between genes affects recombination frequency? My main concern is question ...
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1answer
32 views

X linked traits expression in females

We all know that females have an inactivated X chromosome (Most of its genes are inactivated). Consider a female who is a heterozygous carrier of an X linked abnormality, If the inactivated X was that ...
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0answers
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Do primates have genetic predisposition to dominance hierarchies [closed]

I’m looking for some evidence to prove (or disprove) that primates are genetically predisposed to dominance hierarchies. I would appreciate any pointers/references to scientific literature. PS: The ...
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1answer
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The organisms of the same species with a different number of chromosomes [closed]

I am looking for some specific creatures. The organisms of the same species that have different chromosome numbers. Just like male grasshopper (23 chromosomes) and female grasshopper (24 chromosomes). ...
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1answer
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How do I interpret this graph regarding introduced genes and virus-infected cells?

This graph appeared in a practice test for the MCAT. I am trying to interpret it, but it confuses me a bit. On the x-axis we have some introduced genes, and on the y-axis we have % of cells infected. ...
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0answers
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How would you use PGAl to select for mutants of beta galcodosidase gene (z-) and permease (y-)?

How would you use PGAl to select mutants of beta galcodosidase gene (z-) and permease (y-)? Or do you just use PGAL to grow these mutants after you've isolated the mutant gene and inserted it into a ...
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1answer
43 views

Question regarding when it's a homoplasy in a phylogenetic tree

If you have 2 organisms that both come directly from the same common ancestor on a phylogenetic tree, and that common ancestor does not have trait "x", is it possible for both of its direct ...
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1answer
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Are microsatellites viable markers for GWAS?

I'm just reading some papers on genome-wide association studies and find that most of them use SNPs as a marker. I understand that they're the most polymorphic and thus the best for accurate ...
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Projects in DNA Computing [closed]

I am physicist and have recently heard about DNA computing. I want to work in this area. I want your ideas on a "feasible but new project" (maximum time I can put on the project: 6 Months ), I can ...
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1answer
63 views

Would our body adapt to changes that are not in our DNA?

If a person was to undergo a treatment or surgery at a very young age, that significantly reduced their final height, would the rest of their body adjust to the sudden change? If not; because our arms’...
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0answers
721 views

What are the advantages of sexual reproduction over asexual reproduction? [closed]

What are the advantages of sexual reproduction over asexual reproduction? How does variation influence ecological and evolutionary success?
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2answers
81 views

Linked genes outcomes in offspring

This question is from a genetics session in my university: The test cross between a plant with smooth and yellow seeds and a plant with wrinkled and green seeds gives the following results: 140 ...
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2answers
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2answers
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Probability of carrying an autosomal recessive trait given both parents are carriers

I recently came across a question that asked for the probability of having a child with an autosomal recessive trait, namely cystic fibrosis. From various parts of the question, we can conclude that ...
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0answers
20 views

Genetic Inheritance [closed]

With suppression in mind consider the following in a system that requires two genes (and their products) to produce a function or phenotype: The products of the two genes are both necessary and ...
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1answer
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How do eukaryotes terminate transcription? (clarification on Campbell Biology)

I'm having trouble understanding how eukaryotes terminate transcription. Studying Campbell Biology (pg. 342, 10th ed.), I read: In eukaryotes, RNA polymerase II transcribes the polyadenylation ...
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2answers
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Meaning of Phred score - probability of base calling error

I learned that Phred quality scores are logarithmically linked to error probabilities. For example, if Phred assigns a quality score of 10 to a base, the chances that this base is called incorrectly ...
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0answers
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Are there any DNA base sequences that are shared by every living being that we know of? And if yes, are some of those sequences “silent”?

In "every living being" I am not including viruses as another question already answered that. I have read that some part of the DNA sequences of humans and other animals/plants are "silent" as in not ...
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1answer
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Why does the definition of a “gene” require it to have a product?

In a textbook, I found the following (emphasis in the original): At this point, we can provide a molecular definition of a gene as a sequence of DNA that specifies production of a functional ...
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0answers
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Transcription - strands, directions [duplicate]

I am hoping that you can help me improve my understanding of transcription. :) I have tried searching for the answers to all of these questions online already, but I have either had trouble finding ...
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0answers
123 views

How does DNA code for the actual *shape* of individual body parts/areas (NOT segments or Hox genes)?

Just to save the trouble - I am not asking for general information on how DNA codes for proteins and definitely not how Hox genes work. I have a very good understanding of the evolutionary process and ...
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1answer
24 views

What do the haploinsufficiency scores in the clinVar database represent?

I understand that haploinsufficiency occurs when one of the two copies of a gene is mutated to the point of being unusable, and the single copy remaining is unable to cope with the cell's demands for ...
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2answers
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Online phylogenetic tree of human lineages

I am looking for a source of information about the diversity of human lineages and their relationships. With a quick google search it is easy to find this type of tree A perfect online resource ...
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1answer
123 views

Why do some animals have beards?

Why do some animals such as some Goats, Ibex, Orangutan etc, have long well-shaped beard like men?
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2answers
15k views

What is the number of DNA strands per cell?

I wonder if each cell possess only one strand of DNA which according to my book is more than "7 feet" long(if uncoiled), then why does human has 46 chromosomes which are actually coiled chromatin (DNA ...
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2answers
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Why are GC-rich regions less condensed than GC-poor regions?

As far as I know, chromatin consists of two kinds: Heterochromatin is more condensed so translational factors have less access to this region, and this region is poor in GC. Euchromatin is less ...
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1answer
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Does reversion of resistant strains to wild-type only occur when no more drug pressure is exerted

We always read that wild-type reversion of a resistant strain occurs when no more drug pressure is exerted. Could resistance reversion also occur under drug pressure, but from a drug other than the ...
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0answers
20 views

Factors affecting which chromosome will come from the father

Tell me please. In course of biology, I remember that a man has XY chromosomes, and a woman has only X. Accordingly, depending on which chromosome comes from Father(man) Y or X, a girl (XX) or a boy (...
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1answer
88 views

DNA of identical twins

I read an article which says that identical twins have 100% similarity between their DNA, but they have different fingerprints. Does that mean the DNA is different in the fingers? What body features ...
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0answers
22 views

Is bi-allelic gene expression random?

Supposing we have the genotypes “Aa”, “AA”, and “aa”... which are not mono-allelic (not imprinted and not X-inactivated). Does the dominance of the “A” allele over “a” allele affect which gene is ...
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1answer
98 views

What is the most genetically complex organism?

I understand that new genomes are being sequenced ever day and these answers replace themselves often; although as of today, what has been proven to be the most genetically complex organism (Other ...
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2answers
399 views

Do genes play a role in the athleticism and shape of a person?

I am an Indian with a small thin stature with some deposition of fat around my belly.I was wondering if genes play a role in fat deposition in the body for Indian, Chinese, European or African people. ...
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1answer
307 views

Is there some genetic variance underlying music appreciation?

Is there any research done on the genetic variance for Music appreciation? If not, why is there no genetic variance for this trait?
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1answer
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Are there examples of Apis mellifera of different colors?

Re: my previous species-identification question, What species is this gray bee? I'm still curious: Are there any recorded/reported cases of either albino Apis mellifera, or at least with ...
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2answers
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How do mutations with very little fitness benefit get fixed?

I have one little issue with evolutionary theory that I have not been able to understand. Suppose genetic mutations happen from generation to generation. Nevertheless, from one generation to the next ...
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2answers
49 views

Does low gravity exposure to early stages of human fetus have potential to unloc unused genetic information from earlier stages of evolution?

The title seems quite self explanatory but let me elaborate. New mutations do take a very long time and many generations to occure in the genetic code. But our genetic code already holds all the ...
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2answers
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Is it possible that by mutation a human could see infrared or other 'colours'?

Incoming light reacts with the several types of cone cells in the eye. In humans, there are three types of cones sensitive to three different spectra, resulting in trichromatic color vision. Each ...
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1answer
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Size constraints on CRISPR guide RNA

I had a quick questions on the size limitations of a CRISPR guide. More specifically on the shorter end. Can I make a guide that is say 7-10bp and still have an active complex? I transfect using an ...
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1answer
45 views

Difference between crossover rate and recombination rate?

I am not a biology student and therefore, need clarification if crossover rate and recombination rate are the same thing. So if the text says 'recombination rate per base pair per generation' or '...
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4answers
5k views

The human has 46 double chromosomes or simple chromosomes?

What I mean: does the human cell have 46 of these: or 46 of these: Thank you in advance.
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0answers
28 views

Convergence compared to genetic distance

Is there an information (preferably in the form of a chart, though anything will do) comparing convergent evolution to how closely related the 2 species are on the tree of life. My searches for ...
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3answers
289 views

Double stranded RNA Single stranded DNA

I have seen in textbooks referring to ds RNA and ssDNA. How a RNA can be double stranded and likewise how a DNA can single stranded and if they do exist why are there names not interchanged?