Questions tagged [genetics]

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

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598 views

Dominant and recessive epistasis [closed]

Can anyone clarify my confusion about that the epistasis seen in "Labradors , an example of recessive or dominant epistasis? ? I am not getting definite results . It's dominant somewhere and ...
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42 views

What controls the growth of a body?

Everything in our bodies is made of cells - bones, muscles, brain, blood. How do cells know how to build a body? Granted, each cell has a blueprint of the whole body in its nuleus, the genome. Does ...
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Does gene isoform have different genetic location?

I would like to understand how a gene is assigned to a specific coordinate (e.g. NOC2L Chr1 879583(Start) 894679(End)). Next, let's say NOC2L gene has a few different isoforms, do those isoforms ...
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66 views

How do you determine “in which direction” DNA is shared between groups of people

In popular DNA ancestry tests you can read lines like "you have 2% neanderthal dna" or "you have 20% italian". How can you distinguish between a person having 20% italian vs ...
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What does allelomorph mean?

Is there any difference between allele and allelomorph since most websites call them the same. If they are same then why two different term?
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2answers
112 views

Do identical twins have the same metabolism rate at birth? [closed]

Will monozygotic twins defecate at the same time if fed at the same time during the first weeks of life? They should have the same genetics (and epigenetics) since they are monozygotic and the same ...
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2answers
62 views

Possibility a child could genetically be also the child of its grandparent

When two people have sex, it is my understanding their diploid set of chromosomes is randomly split in half to create two haploid sets which unify into the diploid chromosome set of the child. For ...
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62 views

Large study showing that attraction to only the same sex has to do with your genes, published where?

Can someone please help me out and find and link me the study from a couple of years ago that showed how only same sex attraction, when the male cant become attracted to a woman, it has to do with ...
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94 views

Why does X inactivation happen?

Is X inactivation really important? Why don’t the dominant genes on one chromosome mask the recessive on the other chromosome? This happens in other sets of chromosomes so why exactly does this happen ...
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49 views

Probability for a megafauna specimen to exhibit a gene not present in either parent

What is the rough probability for a megafauna specimen to exhibit a gene not present in either parent? I'm looking, ideally, at the chance for one specific individual to be the first in a breeding ...
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54 views

Is there a name for survival of the fittest in a single family? [closed]

Imagine a case where the children of a bird each have a 50% chance of being born blind. But the bird always has on average 4 chicks. So on average 2 will be blind and 2 sighted. (Perhaps this could ...
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Confusion about result of monohybrid cross in Mendelian genetics

I was studying monohybrid crosses in genetics where the character considered is stem height. Whenever I came across punnett squares, I used to calculate the probability of the genotype of the ...
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67 views

How do biologists discover information from fossils? [closed]

I have a query about the study of fossils (palaeontology). Let me know about the study of fossils. How do biologist discover "DNA" information from dead and old fossils such as a dinosaur? (answer ...
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92 views

Is evolution theory falsifiable by whether mutations result in a loss or gain of genetic information? [closed]

If I understand the theory correctly, evolution revolves around the process of adaptation of a being to its environment which results in the increment of survival and reproduction chances for that ...
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54 views

What impedes the understanding of genotype/phenotype relationship without statistics? [closed]

Most genetic research tries to establish a relationship between a certain genotype and certain phenotype. To me this is like trying to understand a system as a black box, where you try to establish ...
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196 views

Basic questions about human genome project [closed]

The "human genome" was sequenced by the Human Genome Project around 2000. But I don't understand what was done and what its significance is. Questions: Wasn't a single person's genome sequenced? I....
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196 views

Why the SNPs from the earliest human haplogroups are missing in people outside of Africa if they are infact the descendants of it?

The SNPs M91, P97, M31, P82, M23, M114, P262, M32, M59, P289, P291, P102, M13, M171, M118 from haplogroup A and SNPs M60, M181, P90 from haplogroup B are missing in people without recent African ...
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50 views

Neuroscience - A neuron with two types of synapses (electrical and chemical) at the same time

I learn that the nerves from the Peripheral Nervous System can carry signals from and to other organs of the body. I'm wondering if A Single Nerve carries 1) Only chemical signals 2) Only physical ...
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148 views

Can the environment affect genes and adaptation in offspring?

I recently read several articles that believe that environment can affect gene expression and this change will transfer down to the children. Some theorists believe that random mutations are more rare ...
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108 views

How should I interpret for example AA result, when SNPedia only has CC/CT/TT listed? [closed]

I don't know how to properly formulate this question because I'm new to this, so please edit this if you can... For example when I would check SNPedia for rs gene, it would have listed CC/CT/TT genes,...
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77 views

Non-Ethical Issues with Eugenics [closed]

Notwithstanding the obvious ethical issues with the idea of eugenics, I have read in many sources that eugenics has practical issues or otherwise "would not work", but I haven't been able to find an ...
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88 views

What can a human do in a short time (10-20 years) to improve their genome?

I'm wondering what can I do to make my children receive better genes? For example, can fitness, cold showering, studying etc. change my hereditary material and affect my children?
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59 views

Is it possible a cancer cell don't express any foreign antigens? [closed]

For example, there're tumor suppressor genes. Can we just delete them, without introducing neo-antigens? Would the resultant cells proliferate? If so, how do our immune system identify such cells?
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609 views

Why was the study of “Concordance of Monozygotic and Dizygotic twins for traits” designed in this way? [closed]

I am confused by the twin study 'Concordance of Monozygotic and Dizygotic twins for traits.' My questions arose from 3:17-4:17 of the video And this is the related data I have referred I have ...
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296 views

Assuming if height was fully determined genetically, what would be the concordance between monozygotic pairs?

I fully understand the differences between monozygotic and dyzogtic twin pairings, but I wondered how I could put into words the reasons why the concordance would be very high. Derived from same ...
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60 views

Genotypes without Recombination

When given that the parent generation's genotypes are linked traits, how do you determine the genotypes of the F1 generation when no recombination has occurred. For example, given the parents BbNn ...
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44 views

Best fundamental literature about genetics [closed]

I'm seeking for good genetics literature. I'm not afraid of it's complexity, because I want to have relevant knowledges about molecular genetics. After Wikipedia articles and basic molecular-biology ...
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71 views

Is it true that if a human lived long enough (up to 3-400 years), he/she would eventually develop cancer?

I have just studied DNA, but I am not so clear. So, I would like you to explain it more clearly. This is what I think when a human grow older and older, his or her DNA repair mechanism would be ...
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54 views

Frameshift Mutation

With regards to LMNA frameshift mutations further downstream in the tail region, specifically (p.Arg455Gln fs*5) which has yet to be found/recorded in any medical literature...Does anyone have any ...
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65 views

Why is sickle cell trait expressed in half of all cells rather than all cells containing half-sickled haemoglobin

If sickle cell trait is due to be heterozygous with respect to a single gene mutation on the haemoglobin β-globin chain, why is it the case that ~50% of RBCs are sickled rather than half of the ...
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56 views

The First Polymerase

Knowing that polymerase protein is needed for the transcription of genes, which polymerase is used in the transcription of polymerase protein itself?
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Consider gene is countable, can anyone give a concrete example of “a gene”?

gene is a countable noun but people always say genes, so what is A gene? for instance, Each chromosome contains many genes, so, which part of the chromosome of Escherichia coli could be ...
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113 views

Is it possible to change the DNA of all the cells of an adult human [closed]

The process of making and transferring changes is pretty straightforward relatively speaking in an embroyo. You change the DNA of one cell and all the cells now inherit this change. But let's say ...
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124 views

Fertilization of the human egg- where does our centrosome come from? [closed]

Is there a centrosome in a human egg cell? Is the reason why the egg cell remains paused before meiosis 2 because there isn't a centrosome, and it only divides when the sperm fertilizes it thus it can ...
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1answer
2k views

Dihybrid cross question

An experiment is set up to study two genes. The two genes assort independently and for each gene the expression of alleles involves complete dominance. In the genetic cross RrTt x RrTt, a number of ...
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53 views

Lac Operon and Arabinose Operon

In the lower concentration of glucose, what among lactose and arabinose, when both are present in the growth medium, is more likely to be utilized by E. coli?
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Neutral genetic mutations in eukaryotic cells [closed]

Why are most mutations in eukaryotic cells neutral? i.e. have no effect on the phenotype.
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Assessing carrier Risk

susan has been found to be a carrier of Tay Sachs. what is the risk that her maternal aunt is also a carrier if we don't know her parents status?
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Is there any mechanism that prevents DNA of an eaten entity's cell from affecting that of own?

When we eat food I heard that our digestive enzymes disassemble the DNA of the eaten cells so that the DNA cannot affect us. Then, is there any mechanism (that prevents the eaten cell's DNA from ...
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Simple Autosomal Recessive question by a novice genetics student

How do you figure the percentage of offspring that will be a carrier of an Autosomal Recessive gene when the FATHER is the recessive carrier and the MOTHER is not affected (normal, no recessive)? ...
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142 views

How did humans know the process of domesticating animals?

If people in ancient times had no scientific knowledge about natural selection and Darwinism, how were they knowledgeable about animal domestication and artificial selection? What tools and ...
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Behaviour of chromosomes and genes

I recently read a comparison between behaviour of chromosomes and genes - which had two statements understated - Independent pairs segregate independently of each other One pair segregates ...
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678 views

How does selection affect allele frequency?

Question People who are carriers for Blooms Syndrome have developed a selective advantage. How would this affect the allele frequency of the disease allele? My thoughts Natural selection will ...
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235 views

Law of Segregation (Genetics) [closed]

What if the two factors/different factors of a character did not segregate during gametogenesis and blended together?
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Somatic cell cloning always produces female offspring? [duplicate]

I was looking at the somatic cell cloning of goats. One of the advantages of the process said was All offspring produced are female. Now I'm confused. How is this the case? I know that the ...
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100 views

Why can't the mutation for this simple pedigree be X-linked recessive?

http://ocw.mit.edu/courses/biology/7-012-introduction-to-biology-fall-2004/exams/finalprac.pdf For question 7a on pages 10-11 of the above link, why can't the mutation be X-linked recessive? The ...
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Can Females Songbirds Have Male Plumage?

Male birds are colorful for courtship displays, females are dull for camouflage. But, is written in a website somewhere that sometimes, when females birds are sterile, they grow male plumage due to ...
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Will our biological bodies be changed after we’ve occupied and settled Mars? [closed]

I had this question in mind for very long time, and I could not find a clear answer on the Internet, so I was hoping that you might know the answer. If we will bring life to planet Mars and a few ...
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Proteins in different organisms

I know that DNA is universal meaning that all organisms have the same 4 base pairs and also that the same codons code for the same amino acid in all organisms. What I am wondering is that say humans ...
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Did cats evolve from monkeys ? or vice versa?

Did cats evolve from monkeys? or vice versa? How similar are the genes of cats and monkeys? What is the proof that they are related or that they are not related? Most monkeys climb in trees and ...