In diploid organisms, if there is one recessive and one dominant allele of a gene, then the phenotype will be determined by the dominant allele.
A dominant trait occurs when either both alleles are dominant or one allele is dominant and the other is recessive. This is because a dominant allele overpowers a recessive allele. In order to have a recessive trait both alleles must be recessive.
why do you think they're called dominant traits genius^^very rude^^Actually, some recessive traits are more common in a POPULATION.
a dominant gene.
Most definitely dominant. This is why they are a rarity. They'd occur more often if they were recessive.
This disease results from a mutation on the x-chromosome. It's recessive considering that a dominant will only cover up things that have occur, for example the damage that has occured, with something else. A recessive will continue to give latent traits. The allele in Adrenoleukodystrophy can only be caused by heredity mutation thus making it recessive.
Codominance is when neither trait is dominant nor recessive. Both traits are equally likely to occur and the offspring is often from a blending trait. For example, if two co dominant animals mate and one is brown and the other is white, the offspring will be a blending of both colors.
In one allele (recessive) the transcriptional or post translational processes does not occur due to some modification and doesn't express while in other allele it occur (dominant).
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.
Disruptive selection occurs when there is selection against the heterozygous individual, causing the population of homozygous dominant and homozygous recessive individuals to increase, splitting the population into two groups corresponding to the dominant/recessive alleles.
Consider recessive traits on the X chromosome. Women have two of these, so it is statistically less likely that a woman would express this recessive trait and much more likely that it would be masked by a dominate X chromosome. If a male gets a recessive X from his mother ( remember, males have one X and one Y chromosome ) it is going to be expressed as there is no corresponding chromosome to mask it.
probability the likelihood that a particular event will occur codominance a condition in which neither of two alleles for a trait is dominant nor recessive
Codominance is a genetic type of interaction between alleles. It happens when the alleles are neither dominant nor recessive, they are equal.
What is the relationship between dominant and recessive traits? Think of it this way-- A dominant gene will suppress the expression of a recessive gene. A dominant trait is the expressed result of an organism having either one dominant and one recessive gene for that trait, OR two dominant genes for that trait. For example, brown eye color is normally dominant over blue. A recessive trait is the expressed result of having two recessive genes. For example, you need two recessive genes to get blue eyes. Each parent contributes one gene for each trait. If a parent carries a recessive gene for blue and a dominant gene for brown, that parent will have brown eyes, but can contribute either gene to a child. If the other parent has the same, the child could have two brown eyed parents but have blue eyes. Eye color is a visible trait, but each gene location can be or contribute to a trait not visible to the eye. For example, the genetic disposition to ovarian cancer is not something we can see without genetic testing. A recessive gene can be inherited and remain silent for generations, waiting to pair up with another recessive to be expressed. The knowledge that this does occur is one of the reasons why genetic testing is recommended before having children. There are so-called lethal genes that are recessive and only become problematic when they meet up with another. I know I have simplified things here, but I hope that gets to the core of your question. I recommended taking a look at the OMIM.org website to appreciate how complex this really is. That the unraveling of the miracle of the human genome has been accomplished during the last decade is truly wonderful.
Under most circumstances yes, however if the majority of the population was filled with homozygous recessive genotypes the majority off the offspring would most probably be recessive. For example see hemophilia, the disorder where you can't stop bleeding, the trait for this is dominant over not having it
only recessive sex-linked disorders occur more often (dominant are more common in females) because they only have one X chromosome
This depends entirely on the genotype of the parents. The probability of getting a specific genotype is the probability of getting the correct allele from mother (1/2) multiplied by the probability of getting the correct allele from father (1/2) multiplied by the number of ways this can occur. The probability of getting a phenotype, if the phenotype is dominant, is the sum of the probability of getting two dominant alleles, and the probability of getting one dominant allele. If the phenotype is recessive, the probability is equal to the probability of getting two recessive alleles.
Increased mixing of genetic material occurs during sexual reproduction which, in turn, increases the chance that successful genetic mutations in individuals will be passed on to offspring. Further, individuals with different successful mutations can mate and produce offspring that carry both traits. If the traits are dominant they will be immediately beneficial...if recessive they will begin to occur in the F2 and beyond offspring.
well all genes comes in pair one is dominant and other is recessive but gametes do not come in pair as only one can come from the parent.
Brown is dominant and Green is somewhere in the middle. There are possibilities that this may occur but without the genes then it is hard to tell. To get blue eyes both parents would need blue eyed recessive genes and the kid would have to receive both those recessive genes which is very rare. In this case blue eyes is not a sex-linked gene so its possible the the male and female with have a female with blue eyes. Most likely the child will have brown eyes though. This is because if the son does get the recessive from the mother, but gets the dominant from the father, the dominant will overpower the recessive and the son will just be another blue eye gene carrier and himself have brown eyes.
when environmental conditions change and the adaptive traits of the species favour survival and reproduction of members with different traits.
An allele is a form of a gene. Basically, in simple Mendelian genetics, there are two genes that can be expressed: the dominant form and the recessive form. A pea plant can be tall (dominant) or short (recessive). If a plant is tall, what controls that tallness is a gene. The fact that it is tall is due to the presence of the allele. ----------------------------------------- Simple improvement: The gene locus is the position on the chromosome that controls a specific trait (e.g. colorblindness). Alleles are different genetic sequences that can occur at that position to give a specific trait (colorblind, not colorblind). Since in humans there are two gene loci for each trait (one from mother and one from father), alleles can either be dominant-recessive (recessive only expressed when dominant is absent), codominant, or incompletely dominant, etc.
Since we inherit genes and not traits, the dominant allele might contain the genes that increase risk for disease or disorder. Genetic disorders most often occur in early human development.
recessive sex-linked, X chromosome disorders, haemophilia is more likely to occur in males than females.
Traits like eye color are inherited as alleles (a gene that can have alternate forms) from both parents. In the case of a trait determined by one gene, each parent passes on one allele, giving the offspring a total of two alleles, one in each chromosome in a pair. Alleles can be dominant or recessive: A or a. For example, an allele for brown eye color is dominant, or A, while blue is recessive, or a. There are four possible combinations: AA, Aa, aA, and aa. Blue eyes can only occur if no alleles for brown eyes are present-- that is, only in case aa. The other three cases would produce brown eyes. In traits governed by many genes, it is more difficult to map inheritance.