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No. If you think of some of the dominant human phenotypes, you'll notice they are uncommon (or even very rare). Examples are sexydactyly (six fingers/toes), Huntington's chorea, photic sneezing, widow's peak, cheek dimples, cleft chin, and achondroplasia (the most common form of dwarfism). The reason is because the dominant alleles that cause these phenotypes are uncommon in our gene pool.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoIn: Cells and Genetics [Edit categories]
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How many phenotypes does the trait have?
Aa AA aa If A dominant, two phenotypes.
Why isn't it possible to have more genotypes than phenotypes?
I think you have the question backwards, "Why isn't it possible to have more phenotypes than genotypes?" There are always more or an equal number of genotypes relative to phenotypes. The phenotype for a simple dominant/recessive interaction (for example) T for tall and t for short where TT is tall, Tt is tall and tt is short has three genotypes and two phenotypes. If T and t are co-dominant then TT would be tall, Tt would be intermediate and tt would be short. (Three phenotypes and three genotypes.)
Why phenotypes don't always express its entire genotype?
Phenotypes are the entirety of the observable traits. Genotypes are the instructions in the genetic code. Dominant alleles override the recessive alleles, making only the dominant alleles expressed.
What are the phenotypes of two dominant alleles?
When taking two alles as A and a. They are AA and Aa
Recessive allele is more common or dominant allele?
Not necessarily. I think the dominant genes are more common, but there are lot of exceptions out there. For example, having six fingers in humans is a dominant gene, but it isn't all that common.
Which genotypes have dominant phenotypes?
The genotypes in which one or more alleles is dominant.
How many phenotypes does the trait have?
Aa AA aa If A dominant, two phenotypes.
Why isn't it possible to have more genotypes than phenotypes?
I think you have the question backwards, "Why isn't it possible to have more phenotypes than genotypes?" There are always more or an equal number of genotypes relative to phenotypes. The phenotype for a simple dominant/recessive interaction (for example) T for tall and t for short where TT is tall, Tt is tall and tt is short has three genotypes and two phenotypes. If T and t are co-dominant then TT would be tall, Tt would be intermediate and tt would be short. (Three phenotypes and three genotypes.)
Why some phenotypes are more common in a population than others?
Fitness.
What Does the phenotypic distribution look like in a population that is not undergoing natural selection for a certain trait?
The distribution will center towards hetrotrophs and thus dominant phenotypes. The distribution approaches all dominant phenotypes
In a population that is not undergoing natural selection for a certain trait what does the phenotype distribution look like?
The distribution will center towards hetrotrophs and thus dominant phenotypes. The distribution approaches all dominant phenotypes
Why phenotypes don't always express its entire genotype?
Phenotypes are the entirety of the observable traits. Genotypes are the instructions in the genetic code. Dominant alleles override the recessive alleles, making only the dominant alleles expressed.
What are the phenotypes of two dominant alleles?
When taking two alles as A and a. They are AA and Aa
Recessive allele is more common or dominant allele?
Not necessarily. I think the dominant genes are more common, but there are lot of exceptions out there. For example, having six fingers in humans is a dominant gene, but it isn't all that common.
The outward appearance of a particular trait is called?
The outward expression of genetic traits are called phenotypes. Phenotypes expression include recessive and dominant genes such as eye and hair color.
What was the ratio of dominant to recessive phenotypes in the F2 generation of Mendel's experiments?
(Apex Learning) 3:1.
Can you determine whether an allele is dominant or rescessive on the basis of the ratio of the phenotypes in the population?
no. Yes, it is possible in a test cross
