....i don't even get this question i just need help.
2006-12-10 06:02:09 · 14 answers · asked by little pizzi 2 in Science & Mathematics ➔ Biology
No, unless it is present on its own.
Humans have two sets of chromosomes which contain genes. Some genes have different versions which produce different effects e.g. producing brown eyes or blue eyes.
If you have two copies of the brown eye gene you get brown eyes.
If you have two copies of the blue eye gene you get blue eyes.
If you have one brown and one blue, you don't get a mixture, you get brown eyes again. This is because the brown eye gene is dominant and the blue eye gene is recessive. If a brown eye gene is present, it will be expressed in preference to the blue eye gene.
So, sometimes recessive genes are expressed, but only when the dominant version is not present.
2006-12-11 05:29:38 · answer #1 · answered by in vino veritas 4 · 0⤊ 0⤋
No. Neither the dominant nor the recessive gene is ALWAYS expressed. The dominant gene is most commonly expressed as there are greater odds to that. A recessive gene can only be expressed if both parents are carriers of the gene.
2006-12-10 14:15:39 · answer #2 · answered by Lime745 3 · 0⤊ 0⤋
No it isn't always expressed. Both parents need to have the same recessive gene in order for it to be expressed in their offspring. It goes a little somn like this
ONE PARENT WITH RECESSIVE GENE
(B=dominant gene i.e brown hair)
(b=recessive gene i.e blond hair)
Bb+ BB (dad + mom)
their kids
1)BB
2)BB
3)Bb
4)Bb
Only half the kids carry the recessive gene. All of them have brown hair (the capital B dominates and therefore that gene is expressed)
BOTH PARENTS WITH RECESSIVE GENE
bb+ Bb
kids
1)Bb
2)Bb
3)bb
4)bb
Half the kids have the recessive gene expressed and the other half don't (they have the dominant gene expresed)
Note: this is just a scientific guess. obviously if you have four kids the gene won't always turn out like shown above.
God... did that even help at all? I hope it did... maybe it just made you more confused. Search up "Punnet square" that might help
2006-12-10 14:13:57 · answer #3 · answered by Madamoiselle B 1 · 1⤊ 0⤋
the recessive gene will only be expressed if there are 2 recessive genes present. otherwise, the dominant will always be expressed.
eg. mam= Aa
dad= Aa
children= can be AA, Aa, aa
so here, the recessive gene is only evident once.
2006-12-13 13:28:27 · answer #4 · answered by Anonymous · 0⤊ 0⤋
No, the recessive gene is not always expressed.
You need TWO recessive genes (one from each parent) in order for that trait to be shown.
The DOMINANT gene is the one that is always shown. If this gene is given to the child, this trait will DOMINATE the recessive gene.
2006-12-10 14:08:20 · answer #5 · answered by Br 3 · 0⤊ 0⤋
A recessive gene is only expressed when it is when two recessive alleles are put together. If there's a dominant and recessive allele, then the dominant allele will be expressed, but the person would be a carrier for the recessive allele.
2006-12-10 14:06:04 · answer #6 · answered by nadalalex 3 · 0⤊ 0⤋
Recessive genes are only expressed when there are two of them as in 'aa'.
Anytime you throw in a dominant trait, the recessive trait is masked and does not show up, like 'Aa', only the A would be visible.
2006-12-10 14:04:58 · answer #7 · answered by dixiechck615 3 · 0⤊ 0⤋
NO! the fact that's recessive should tell you that. it's only if two parents have the recessive gene, that the characteristic can be expressed.
2006-12-10 14:04:20 · answer #8 · answered by stitchfan85 6 · 1⤊ 0⤋
No..
Recessive genes are not normally expressed...
By definition..."Recessive"...
2006-12-10 14:10:27 · answer #9 · answered by Anonymous · 0⤊ 0⤋
nope but it depends as the type of mutation matters like in certain deficiency caused by reccessive. having only one allele does not gurantee problem free. Milder syptoms may occur instead like that only sickle cell anemia
2006-12-12 10:08:22 · answer #10 · answered by wonght12 2 · 0⤊ 0⤋