Linked Questions

11
votes
3answers
13k views

What makes a gene dominant or recessive [duplicate]

We all carry two copies of each gene (outside of male sex chromosomes). If the two differ from each other often one is dominant and one recessive. How does this mechanism work on a molecular level? ...
7
votes
1answer
423 views

Why is an allele dominant or recessive? [duplicate]

Alleles refer to duplicate genes, where one allele can be dominant over the other. What makes an allele dominant or recessive, given that both code for a single protein?.
0
votes
0answers
18 views

How does the difference in the sequences of a dominant and a recessive allele of a gene help in the expression of the gene? [duplicate]

When an organism is heterozygous at a specific locus for a gene and carries one dominant and one recessive allele, the organism will express the dominant phenotype. These alleles vary in their ...
-1
votes
0answers
10 views

Allelic dominance and recessiveness [duplicate]

What is the reason for the allelic dominance and recessiveness of a gene? Is it all about the chance or probability of getting the fusion of a particular character ? So how can be there a dominance ...
3
votes
2answers
1k views

Do recessive alleles really exist?

This question may seem illogical to some, but I seriously have this doubt. I searched google for some proofs but they were extremely complex and I couldn't understand anything. I was just wondering ...
4
votes
3answers
2k views

Difference between null and recessive allele?

I get that in a single gene locus, an individual can have RR, Rr, or rr as the two alleles ...
7
votes
1answer
274 views

Evolution of dominance of alleles

Can someone tell me where can I find detailed text about mechanisms of evolution of dominance? Or, if it is possible, I would be grateful if someone will tell me about them here.
2
votes
1answer
1k views

Dominance coefficient

I am trying to understand the meaning of the dominance coefficient. I'll be more specific to what I don't understand, in a moment. Let $A_{11}$, $A_{12}$ and $A_{22}$ be genotypes with fitnesses $1$, $...
4
votes
1answer
126 views

Can difference in the expression potential of alleles lead to dominance?

Several hour ago I was in thoughts what allele dominance really means on molecular level. As we know from basic genetics, if the organism had Aa type of some gene ...
2
votes
1answer
74 views

How can individual strands of coat hair have only a single color when considering codominance?

I understand how codominance works. We have two (or more) alleles for one gene, neither having dominance over the other. They are both expressed independently, which means that different phenotypes ...
1
vote
1answer
54 views

Why X-chromosome linked diseases happen due to recessive gene?

All the X -chromosome linked genetic disease I have studied (Color-blindness, Haemophilia, Muscular dystrophy) happen due to a recessive gene. At first, I thought it was because there could be a '...