Genetics???

Question

Can someone explain (in simple flok english, please) this whole dominante/recicive gene thing?? What are the chances of getting a R gene? A D gene? What are the D/R genes? Is there a Idiot gene??

Answer 1

basically a dominant gene is one that is inherited that has more power over ( more powerful and complete enzyme) say a recessive gene. A recessive gene is the opposite. It is weaker and has less ability to completely show all the way through ( physically, for example), therefore whatever it codes for will be hidden. you can have many combinations of genes, examples A=dominant gene,, yellow in color, a= recessive gene, white in color
Aa= the product will show dominance, or the yellow color
aa=the product will show the recessive gene, will be white
AA=the product will show dominance, will be yellow

in the case of Aa, we have a dominant and a recessive gene, the dominant will win over the recessive gene therefore the result will be a yellow color. (the yellow and white color is just for an example)
The chances of getting each gene can be computed by completeing a Punnett square, which creates a cross between the two genes from which the gene in question is inherited, so chances of getting a certain gene depends on the parents (or the cross of the previous genotypes)
however there are also some cases where ththis is not the case as in incomplete penetrance and some disorders which get more complicated, like diseases. Ex. Achondroplasia , I believe which is a dominant disorder that causes dwarfism and normal height people are recessive for the gene. there are several other instances like this too, not every thing relies on dominance, recessive etc., but most genetics do involve what I described above
It all depends on where the genes came from
Im sorry if I am not clear enough but I hope I helped, there is alot of other great posts on here too
good luck, it can be tricky

Answer 2

A dominant form of a gene is one that "shows up" whenever an individual has even one copy of it.

A recessive form of a gene is one that "shows up" only when the dominant form is not there.

This doesn't work in every type of inheritance, but if you are just starting a unit on genetics and learning the basics, this is what these terms mean.

So if you use this key:
B - black (the dominant form)
b - albino (the recessive form)

Then an individual with the genes BB has black fur.
An individual with the genes Bb also has black fur because the dominant B doesn't let the recessive b show up at all.
An individual with the genes bb is albino because there's no dominant form of the gene to prevent the recessive gene from showing.

Many people think that the dominant gene is going to be a stronger trait or will show up more often, but neither of those assumptions are true all the time. Huntington's Disease is controlled by a dominant gene, and it kills people. I wouldn't call that a stronger form of the gene. Widow's peak is a dominant form of a gene, but in my classes we have about 5 people with widow's peak for every 25 people without.

Answer 3

First, dominant and recessive are terms that refer to alleles (variations of a gene) of a particular gene. Dominant refers to the "more powerful" of the two. In simple Mendelian genetics, if a dominant allele is present, the dominant trait will be observed. In order for the recessive trait to be observed, both alleles must be recessive. The likelihood depends on the individuals that are mated together. 2 homozygous dominant (both alleles are dominant) individuals will produce another dominant individual. When mating a homozygous dominant and a heterozygous (one dominant and one recessive allele) there is a 50-50 chance of producing a homozygous dominant or heterozygous individual, but both will typically express the dominant allele. With 2 heterozygous individuals, 25% for homozygous dominant, 25% homozygous recessive, and 50% heterozygous. Its fairly simple if you look at Punnet squares...at least with Mendelian genetics.

Answer 4

Recessive
Dominant

So you can have rr, rD, Dr, DD
It depends on the genes the parents have.
If both parents have rr then you will have a child with recessive genes that display that phenotype.
If you have rD then the phenotype will be the dominant but it will have both recessive and dominant characteristic information in the gene.

Answer 5

R=resessive
D=dominant

so you get one gene from each of your parents, so you have two of each gene. Your parents also had 2 of that gene and just gave you one of tthem.
The chances of inheriting a dominat or recesive gene depend on what genes your parents have to give you. you could end up with to recesive genes and therefore show the recesive characteristic. you could end up with one recesive and one dominant and show the dominant characteristc/trait. you could get both dominant and also show the dominat trait. ok i would say more but i gotta go....

Answer 6

Dark hair, dark eyes are dominant genes while light eyes & hair are recessive & so on. It'll take too long to explain it all here, so google it.

Answer 7

i think i might have the idiot gene

Answer 8

um the dominnt gene .. is the stronger trait and the recessive gene in the weaker trait...
and i have no idea wat ur talkin about .. hthe AD and.. idiot..gene..