BBC Bitesize - GCSE Biology (Single Science) - Genetic inheritance - Edexcel - Revision 4
What's the difference between Allele and Gene? A gene is a stretch of DNA or RNA that determines a certain trait. Genes mutate and can take two or more. Revise genetic inheritance for Edexcel with BBC Bitesize. alleles. The diagram shows the relationship between the cell, its nucleus, For example, the gene for eye colour has an allele for blue eye colour and an allele for brown eye colour. Alleles are different forms of same gene. Genes are linearly arranged on chromosomes. Chromosomes contain genetic material of cell i.e. DNA.
Now what about an Allele? When the Allele is a specific variation of the Gene. So for example, let's say that you look at the at the same stretch of DNA. We're both human beings and we have for the most part very similar DNA.
So this is-- Actually let me straighten it out. Now we're both human beings and most of our genetic material is fairly similar, but we might have variations in how this Gene is coded. For example, you might have or I might have a let's say, I have a an Adenine right there, but right at that exact spot you might have a different base.
You might have a, I don't know, you might have a, you might have-- Actually let me just-- You might have a Thymine right over there. So it's encoding for a protein, or you know, functional RNA that's playing the same role.
Maybe it has a role in the immune system or role in your skin color or role in how your brain develops, but there's a variation.
How are DNA, chromosomes, genes, and alleles related? | Socratic
There's a variation in how it's coded. Now some of these variations which could arise through mutations, it might not have any impact in the function of the eventual protein that gets constructed. You might just have a different Amino Acid sometimes. In fact, you might not even have a different Amino Acid because many times you have two Codons coding for the same Amino Acid, but even in a case you might have one different Amino Acid in a protein that has 4, Amino Acids it doesn't change how that protein acts or how it functions.
Or sometimes it might. It might change how that protein functions. It might change how that protein regulates other things and whoever knows whatever else, and so you could imagine that you have Genes. This Gene right over here. Maybe it has a role in eye color, and because of this variation or because of other variations that show up in both cases they code for the protein that say regulates eye color, or regulates the amount of pigment you have, but because your variation right over here might lead or help lead-- And these things are very complex, it's very seldom do you have a gene just for this, but this might make you-- especially if you have a Gene like this from both of your parents, maybe this one would go for blue eyes.
Blue eyes, it somehow helps produce blue eyes. While this, while mine somehow helps produce brown eyes. And obviously I'd want to think about which variant of this Gene that I get from my mother, and the variant of this Gene that I get from my father.
What Is the Relationship Between a Chromosome & an Allele? | Sciencing
We all have two copies in our regular somatic cells and our body cells. We have except for-- If we think about the, xx and the xy chromosomes, the sex determining chromosomes, on all the other chromosomes we have two copies of the same Genes. We just have two-- It's just they're different variants. One variant from your mother and one variant from your father, or you could say that they are different Alleles. So Alleles are just different variants. So these are two different Alleles.
They code, they're the same Gene.
They're the Gene that somehow deals with eye color, but they're different variations for that Gene. So the Gene you're speaking generally to that region of DNA.DNA, CHROMOSOMES, GENES & ALLELES. GCSE Science Biology
While the Allele is that specific variation. That flavor of that Gene. Greg Foot explains gene inheritance using cats Genetic key terms are contained inside the cell's nucleus.
These are long strands of DNAwhich are made up of many genes.
What’s the Difference Between a Gene and an Allele?
A gene is a small section of DNA on a chromosome, that codes for a particular sequence of amino acidsto make a specific protein. It is the unit of heredityand may be copied and passed on to the next generation.
DNA is a large and complex polymer, which is made up of two strands forming a double helix. DNA determines the characteristics of a living organism.
With the exception of identical twins, each person's DNA is unique. The order of these letters makes up an organism's genetic code. An organism's genome is one copy of all of their DNA. With the exception of identical twins, no two people's genomes are the same. Some characteristics are controlled by a single gene, such as fur in animals and red-green colour blindness in humans. Each gene might have different forms, and these are called alleles.
The diagram shows the relationship between the cell, its nucleus, chromosomes in the nucleus, and genes. Chromosomes are made from genes which are made from the DNA double helix Chromosomes are found in the nucleus of a body cell in pairs.
- How are DNA, chromosomes, genes, and alleles related?
- Genetic inheritance
- Alleles and genes
One chromosome of each pair is inherited from the mother and the other one is inherited from the father. The chromosome in each pair carries the same gene in the same location.