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Is it true that recessive alleles are never present when dominant alleles are present?
Wiki User
∙ 9y ago
No. They are present but not expressed (seen). Only the dominant alleles are expressed.
Wiki User
∙ 9y ago
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Why a plant with yellow pods can never be a hybrid?
Yellow pods are a recessive trait and for this type of trait to show in the phenotype, both alleles have to be recessive. If there was a recessive allele (yellow) and a dominant allele(green) as it shows in hybrid pods, then the dominant allele would be the one shown and the pod would be green.
Can a recissive gene be dominant?
no. Never. It is impossible for a recessive gene to be dominant but there is the concept of incomplete dominance.
In pea plants green pod color is controlled by a dominant allele Yellow is controlled by a recessive allele Explain why a plant with yellow pods can never be a hybrid?
Because in order to be yellow the only 2 alleles you can have are the 2 recesisve ones, therefore you will always have yellow
What is principle of dominance and recessiveness?
The law of dominance is Mendels Law, which is a principal in genetics limited and modified by subsquent discovery of the phenemonon of linkage. The law of dominance is Mendels Law, which is a principal in genetics limited and modified by subsquent discovery of the phenemonon of linkage.
What are the two types of inheritance involved with blood types?
polygenic inheritanceQ: What type of inheritance is blood type?A: multiple allelesOf all the blood types that hematologists concern themselves with, most people worry about the ABO type. The inheritance for the ABO blood type is codominant, as a parent with A type and a parent with B type can give birth to a child with AB type.
Using the terms dominant recessive explain the difference between genotype and phenotype?
No, I think you have your terms confused.The terms "dominant" and "recessive" are applied to alleles of a genotype. A genotype is an expression (using upper- and lower-case letters) that shows what alleles an organism has for a particular locus. The two alleles (in most cases) inherited (one from mother and one from father) can either be dominant or recessive. The recessive allele is not fully expressed in the presence of the dominant allele and is only expressed when there are two recessive alleles. The genotype could be called "recessive" I suppose if the genotype is homozygous recessive. But remember that two recessive alleles as a genotype is only one possibility - in which case you can't say the "genotype is recessive".The phenotype is dependent on the genotype. If present, the dominant alleles (in simple Mendelian genetics) will determine the phenotype - what the organism's trait or characteristic is. The phenotype will never be what is coded by the recessive allele unless the genotype is two recessive alleles.
Why a plant with yellow pods can never be a hybrid?
Yellow pods are a recessive trait and for this type of trait to show in the phenotype, both alleles have to be recessive. If there was a recessive allele (yellow) and a dominant allele(green) as it shows in hybrid pods, then the dominant allele would be the one shown and the pod would be green.
Why is an organism genotype may be homozygous dominant homozygous recessive or heterozygous but never heterozygous recessive?
I take it you're referring to the phenotype. Say a trait, like flower colour, is influenced by a single gene. The plant will possess two copies of the gene, one from each parent, but only one colour is expressed. Let's say that red is dominant and white is recessive. A plant containing 2 red alleles (homozygous for the dominant allele) will be red. A plant containing 2 copies of the white allele (Homozygous recessive) will be white and heterozygous plant, containing a single copy of both alleles will be red. There is no heterozygous recessive because the dominant allele will determine the phenotype.
How can the homozygous dominant genotype be written?
A dominant Allele is written YY or Homo dominant. That is completely dominant and no recessive. Yy is half or hetro dominant. Forgive me for it has been a while since i talked and brushed on this. Homo recessive is yy. You should and would never see yY. it is written Yy.
Can a recissive gene be dominant?
no. Never. It is impossible for a recessive gene to be dominant but there is the concept of incomplete dominance.
How do genetics represent h dominant and Recessive allele?
A dominant genotype is represented as DD or Dd but with many different letters. The DD is a homozygous dominant, while the Dd is the heterozygous dominant. Recessive is always represented as dd or rr or whatever letter you want to use. It is always homozygous recessive. There can never be a heterozygous recessive.
What does dominate and recessive mean?
Dominant and Recessive refer to different types of genes a child gains from its parents. In general, a dominant gene overpowers a recessive gene (like more people have brown eyes than blue eyes), but there are some cases where recessive genes are visible on a child over the dominant gene.
In pea plants green pod color is controlled by a dominant allele Yellow is controlled by a recessive allele Explain why a plant with yellow pods can never be a hybrid?
Because in order to be yellow the only 2 alleles you can have are the 2 recesisve ones, therefore you will always have yellow
How long can a recessive gene stay hidden in a person?
A recessive gene will stay with a person for their entire life. Whether it will become obvious that the person is carrying a recessive gene is dependant upon how many copies of the recessive gene the person carries - the effects of a recessive gene will only become obvious if two copies of the gene are carried. Excluding the option of undergoing DNA testing for the recessive gene in question, it is perfectly feasible for a person to live the whole of their life whilst never knowing they carry a recessive gene for a certain condition.
Can both dominant and recessive traits be expressed?
If by "all dominant phenotypes" you mean the parents are homozygous, then no. AA x AA will never yield a gamete with AA But if you're talking about heterozygous chromosomes Aa x Aa, then yes
What is principle of dominance and recessiveness?
The law of dominance is Mendels Law, which is a principal in genetics limited and modified by subsquent discovery of the phenemonon of linkage. The law of dominance is Mendels Law, which is a principal in genetics limited and modified by subsquent discovery of the phenemonon of linkage.
Your mom is 5ft 1 and dad is 5ft 10 how tall will you be?
It depends if you have the dominant or recessive genes. You could be very short, or very tall. You can never tell until you stop growing.
