A recessive trait shows up when there is no dominant trait to mask it. For example, say the allele for brown hair is B and for red hair is b. If the father contributes an allele for brown hair and the mother contributes and allele for red hair, the child's phenotype would be Bb and it would have brown hair. However if both parents contributed an allele for red hair, the child's phenotype would be bb and it would have red hair. You can do the same thing for eye color. Say the allele for green eyes is G and the allele for blue eyes is g (I don't know if this is actually correct, but it's just an example). If the father gives the allele for green eyes, G, and the mother gives the allele for blue eyes, g, the child's phenotype is Gg and it has green eyes. However, if both parents contribute alleles for blue eyes, then the child's phenotype is gg and it has blue eyes.
A family tree is a great idea, but the science is based on probability. The
probability that a recessive trait will show up in a family is 25% if both
parents are carriers. In order for a recessive trait to show up in a person,
he/she must inherit a copy of the recessive trait from both parents. If one
parent is recessive, let's say "rr" and the other parent is a carrier, say
"Rr", the probability is 50%. If both parents are recessive, the probability
is 100% (rr x rr). If neither parent carries the trait the probability is 0%
(RR x RR). BUT, this only tells you what MIGHT happen. We all know that the
probability of having a boy is 50:50, but we all know families of all boys.
So it would be interesting to see if the probability works out in your
family. If you do a search on the web for "genetics" or "probability and
genetics" you will get plenty of hits.
vanhoeck
In a question of pure Mendelian dominance/recessiveness there would be 3 cases that match your condition:
If both parents are heterozygous (Aa), neither parent would display the trait.1/4 AA, 1/2 Aa, and 1/4 AA (Aa carries and AA displays trait)
If one parent is heterozygous (Aa) (does not display) and the other parent is homozygous (AA) recessive (displays trait)
1/4 Aa, 3/4 AA (AA displays trait)
If both parents are homozygous recessive (AA) (both display trait)100% AA (AA displays trait)
If the other parent has a dominant gene, than yes it can be recessive.
If you are taking about one parents as in a plant ( or asexual reproduction)
the offspring has exactly the same genes as its parent, so there are no recessive genes.
When two heterozygous parents are crossed together. Ex: Ff x Ff= FF, Ff, Ff, ff
1:2:1 ratio. There is a 25% chance the recessive trait will show up.
No, a not if it is an autosomal gene, however your phrasing implies that it is. a recessive gene must be inherited from BOTH parents to cause the disease.
Sex-linked traits are inherited from the organism's parents.
Dominant gene eg as in Huntington's chorea. H represents Huntingtons dominant trait not the normal condition. AA abnormal, Aa abnormal however possibilty of subsequent offspring of Aa and Aa being aa therfore normal!
Mary's father is normal and has a normal genotype XY while her mother is the carrier of hemophilia and has one X of her genotype infected i.e. she is X*X.
Albino is a rare condition that causes color not to appear in people. You would be albino if your hair and eyebrows were an off white, you were very pale, and in some cases got sunburned easily. If you are concerned for whatever reason, ask someone like your parents or loved one.
yes, vestigial wings are recessive and autosomal.
Recessive gene alleles are ones for which two copies are required to cause disease. Many people may have one copy and be phenotypically normal (non-diseased). People who have the disease will have gotten one copy from each parent, each of whom may be normal unless they, themselves have two copies.
The disease is recessive, requiring both parents to carry the allele for the disease to be found in the offspring. If one parent has it, the offspring can also be a carrier, but it will be recessive, and the offspring will have normal RBC (red blood cells)
Cystic Fibrosis is an example of a disease inherited as an autosomal recessive genetic disorder. Both parents of a baby who has Cystic Fibrosis have one abnormal recessive gene and one normal dominant gene and are therefore, Cystic Fibrosis carriers. Carriers are said to be heterozygous because they contain one normal copy of the gene and one abnormal copy. A baby who inherits cystic fibrosis has inherited the abnormal gene from both parents and is therefore said to be homozygous recessive.
Fyugugy
Sex-linked traits are inherited from the organism's parents.
Thalassemia Intermedia is a recessive trait inherited disease of the red blood cells. In thalassemia, the genetic defect results in reduced rate of synthesis of normal hemoglobin chains.
Duchenne muscular dystrophy inheirited recessively meaning it is not passed nessicerially every generation. DMD is recessive it explain why boys commonly get it, affeted fathers pass it on to 50% of daughters and none of his sons assuming the mother is normal. The daughters aren't affected by the disease but they passes it on to 50% own sons and none of there daughters assuming the father is normal.
No. The gene that causes Huntington's is caused by an autosomal dominant mutation, and one form of inherited Parkinson's is also caused by an autosomal dominant mutation.
Dominant gene eg as in Huntington's chorea. H represents Huntingtons dominant trait not the normal condition. AA abnormal, Aa abnormal however possibilty of subsequent offspring of Aa and Aa being aa therfore normal!
Mutations on recessive genes return to normal in an organism
Hemophilia is a recessive allele condition. Men can get hemophilia alot easier than women as the allele is found on the XY Chomosome pair. With men. they do not have the extra "tail" on the Y chromosome compared to the XX with a female. If the person has the recessive allele on the X chromosome and this person is male, they will be a hemophiliac as they do not have a 'pair' allele which could be dominant to stop the condition expressing itself. On a female, if there is a recessive (hemophilia) allele on one of the X chromosomes but on the other is a Dominant (normal) allele then she will be a carrier of the faulty gene but will not suffer from the condition herself. If the female have a recessive (faulty) gene on each of the XX chromosomes, then she will be a sufferer of the disease.
75%. Explanation: if both parents are carriers than their Gametes would be Dd x Dd, resulting in DD (1/4), Dd (2/4), and dd(1/4), meaning that there is a 25% chance that they will have a child that has the disorder. DD = A normal child that lacks the recessive gene, therefore not a carrier Dd = A normal child that carries the recessive gene dd = A child with the disorder + carries the gene, hence the child's future offspring will carry it as well. Source: Self/Basic Punnet Square