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How many recessive alleles are needed to show up in the phenotype?
Wiki User
∙ 8y ago
Two (together).
Wiki User
∙ 8y ago
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When trait is called recessive?
recessive is when you have another allele that supress the recessive one, you have to thing how this could be done in a methabolic pathway, and you will see that exist many ways for an allele be dominant and the other recessive (you just can say dominant and recessive if you are talking at alleles ,this is genes at the same locus. my mother language is no inglish maybe i have comit many gramatical errors but what i am saying is correc i am student of biotechnology.
What is the difference between continuous and discontinuous genetic variation?
Continuous variation is a variation that is distributable; under a normal curve. Height is an example of this with all heights being along a continuum of heights within populations, at least. This distribution of traits is usually controlled by many alleles in a additive fashion. Polygenic. Discontinuous variation is of one trait, allele, or the other. Blood groups are an example of this. A, B , O. You can only have two alleles here, so AA and AB and OO and AO, AB etc. are the expressed ( less the recessive O, except homozygous ) traits. These are single variations based on one allele and are not distributable along a continuum.
What is a pun net square?
Wikipedia says:The Punnett square is a diagram that is used to predict an outcome of a particular cross or breeding experiment. It is named after Reginald C. Punnett, who devised the approach. The diagram is used by biologists to determine the probability of an offspring having a particular genotype. The Punnett square is a tabular summary of possible combinations of maternal alleles with paternal alleles.[1] These tables can be used to examine the genotypic outcome probabilities of the offspring of a single trait (allele), or when crossing multiple traits from the parents. The Punnett Square is a visual representation of Mendelian inheritance. It is important to understand the terms "heterozygous", "homozygous", "double heterozygote" (or homozygote), "dominant allele" and "recessive allele" when using the Punnett square method. For multiple traits, using the "forked-line method" is typically much easier than the Punnett square. Phenotypes may be predicted with at least better-than-chance accuracy using a Punnett square, but the phenotype that may appear in the presence of a given genotype can in some instances be influenced by many other factors, as when polygenic inheritance and/or epigenetics are at work.
How many manipulated variable are in an experiment?
as many as needed
How many line segmentare needed to connect four point?
four segments are needed
Why are many harmful alleles recessive?
The reason many harmful alleles are recessive is because the harmful alleles that were dominant stopped the carrier from reproducing so the allele was not carried on. A dominant trait is expressed if present and would harm the carrier. A recessive trait however can remain in the genotype of an individual and not the phenotype so they will not be harmed by the trait but can pass it on to offspring. In short: dominant harmful alleles stopped the carriers from producing so the allele was not spread.
Why some chromosomes are recessive and the others are domainent?
Actually a chromosome consists of many genes/alleles and is neither recessive or dominant in and of itself.
How many alleles influence a phenotype in complete dominance?
8
How many alleles are usually in the gene pool for each trait?
Each gene has a dominate and recessive allele, so there are two types of alleles in each gene. The dominate allele is stronger than the recessive allele unless there are two recessive alleles.
How many recessive alleles must a person have to have albinism?
2
Why is it difficult to determine the genotype of an organism that has a dominant phenotype?
NO, because a dominant phenotype could either be homozygous or a heterozygous.so unless you are sure about the genotype of parents we can't determine it...but we can determine the genotype of a person showing reccessive phenotype, as a recessive trait always expresses itself in a homozygous condition...
Albinism is a recessive trait in humans that is controlled by a single gene how many recessive alleles must a person have to have albinism?
2
What causes the change in phenotype frequency in a population after each generation?
Gene mutation causes the phenotype frequency in a population to change after each generation.
How many dominant alleles must be present in order to show the dominant phenotype?
I'm not sure...
Does a dominant allele mask a ressessive allele?
In diploid organisms (those with two copies of each gene carried on separate chromosomes), one of the copies of a given gene may differ from the other copy of the same gene on the twin chromosome. In some cases one version of the gene (the dominant allele) has the effect of 'masking' the activity of the other (the recessive allele); that is, the presence of the dominant allele negates the effect of the recessive allele on the organism's phenotype. There are many mechanisms which can cause this phenomena, and it depends on the particular genes involved, but a simple model is one where the recessive allele is a biochemically inactive version of the dominant allele. In this case the dominant allele would mask the effect of the recessive allele by providing an active version of the gene. The dominant phenotype would be the one which shows the downstream effects of this activity, and the recessive phenotype one which shows the downstream effects of a lack of activity. The dominant allele is said to 'mask' the recessive allele because only one copy is required to result in an elimination of the recessive phenotype, whereas all copies of the gene must be the recessive allele to result in the recessive phenotype.
What is two dominant alleles called?
In eyes, it would be brown is dominant, and blue is recessive. Free earlobe allele is said to be dominant over the attached earlobe allele. When an organism has two dominant alleles for a trait, it is called homozygous dominant. Two recessive alleles for a trait is homozygous recessive.
How many different traits can these alleles produce?
A single pair of alleles would produce only one phenotype.
