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A recessive trait shows up as a visible trait when there are two recessive alleles for that trait. Since there are no dominant alleles for that individual, the recessive trait shows up.
Everyone has two versions of each gene, called alleles, stored in their genetic code: one from their father and one from their mother. The 'genotype' of an organism is the genetic sequence, the phenotype is how this genetic sequence is expressed in the organism for example, someone could have a genotype for hair colour as: 'Ginger allele' (g) and 'Brown allele' (B). If they had one pair of alleles (one from each parent) so they were either 'ginger ginger' (gg) or 'brown brown' (BB) they would express that gene physically in their phenotype this would be a 'pure' or 'true' breed known in Biology as 'homozygous'. If they have two different alleles for one quality as in the first example of a ginger and a brown allele (Bg) then the 'dominant' allele would be expressed, and as the ginger allele is 'recessive' to the brown allele the person would be brown haired - even though they are a 'carrier' for the ginger allele. A recessive allele (like the ginger allele) requires two recessive alleles to be expressed in the phenotype.
If a brown haired man and woman (Bg) were to have a child then there is a 1 in 4 chance the child would be ginger. This is because one allele must be inherited from both parents to control hair colour (as said before). The man would either donate a 'B' (brown) allele or a 'g' allele as would the mother. These would combine to form the child's genotype. The possible combinations are:
..................father
.................. B | g
mother B| BB | Bg
..............g| Bg | gg
As the table above shows there are three possible genotypes: 25% BB (brown), 50% Bg (brown) and 25% gg(ginger). This shows from two parents who are heterozygous - even though they don't express it themselves in their phenotype (they're both brown haired) they have a 25% chance of having a child that expressed the recessive trait.
What else can I help you with?
When a trait seems to disappear or doesnt show up often?
Recessive Trait
Compare and contrast dominant and recessive?
In genetics, each organism will typically have 2 alleles for each trait. For a trait such as hair color, you might have an allele for red hair from your dad and an allele for brown hair from your mom. The trait for brown hair happens to be dominant to the trait for red hair so you would show the allele for brown hair. (In other words, you would have brown hair.)
What happens when a dominant and recessive allele are both present?
The resulting offspring will have the dominant trait. It depends on if the dominant is hetero or homo...if it was homozygous then your offspring will have a hetozygous trait showing the dominant trait (to clear this up if you are confused lets say we are talking about brown eyes(BB-dominant) vs blue eyes(bb-recessive)--a homozygous would give you a brown eyed child with Bb and but if the person is heterozygous Bb and gets with a recessive you have a chance of getting Bb or bb giving you a possibility of a brown or blue eyed child)...wow i just made that way more confusing than it had to be
Is unibrow dominant or recessive?
its neither. its a learned skill. i can do it, and i learned to by holding one eyebrow up, with my finger, and learning to adapt from that. you use muscle in your face when you do it. if you want to learn, wrinkle your forehead that will help you.
Are dominant alleles naturally better for an organism?
No, recessive alleles are equally likely to be inherited (if your dealing with only those two types of alleles). BUT, dominant alleles are the ones that show up. That is precisely why they are called dominant. Compared to recessive alleles, dominant ones will overrule the others, making it the one inherited.
When a trait seems to disappear or doesnt show up often?
Recessive Trait
A recessive trait is one that?
doesn't show up
What is the genotype any time a recessive trait shows up?
The genotype for a recessive trait to show up is typically homozygous recessive (aa), meaning both alleles are the same and both are recessive.
What did Gregor Mendel call the trait that did not show up in the offspring?
recessive
Why are two recessive alleles needed for a recesssive trait to be shown?
bcoz in case of one dominant and one recessive, dominant allele will express its characters and suppresses the recessive ones. so for the expression of recessive characters both allele should be recessive.
What is a recessive traits?
An x-linked recessive trait is a trait located on a x gene that is not dominant. It typically will show up when there is only 1 x gene, in the instance of males. Color blindness is an example.
What is the difference between a dominant trait and a recessive trait?
A dominate trait will most likely take over the recessive.
How Dominant allele different from recessive allele?
You need two recessive alleles to get their trait, but only one dominant allele to get that trait. A dominant allele basically overrides a recessive one if they are together, but the recessive gene can show up in offspring.
Recessive allele different from dominate allele?
You need two recessive alleles to get their trait, but only one dominant allele to get that trait. A dominant allele basically overrides a recessive one if they are together, but the recessive gene can show up in offspring.
How is recessive alleles different from dominant alleles?
You need two recessive alleles to get their trait, but only one dominant allele to get that trait. A dominant allele basically overrides a recessive one if they are together, but the recessive gene can show up in offspring.
What is the difference between the dominant and recessive allele for a trait?
An individual must have 2 recessive alleles in order for a trait to show up. One must only have 1 dominant allele in order for a trait to occur.
What allele whose trait only shows up when no dominant allele is present?
Such a trait is called a recessive trait.
