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The allele not expressed would be recessive whilst the other is dominant. This would be the case in a heterozygous genotype.
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What else can I help you with?
Why is it that a person with an allele for a particular trait may not have a phenotype that shows the trait?
a dominant allele will express its trait , as well as be carried by the person. the word carrier is commonly used for a person who bears an allele which does not express itself(i.e. a recessive gene).
What are dominant and recessive genes?
A dominant gene- A gene That is "stronger" than a recessive geneA recessive gene- A gene that must have 2 of the same to have that look.ex: A gene for being tall=T (CAPITAL T)A gene for being short=t(lowercase t)TT=TallTt=talltt=shortThe GENES WHICH ARE EXPRESSED IN THE PROGENY ARE CALLED DOMINANT AND WHICH DO NOT EXPRESS ARE CALLED RECESSIVE
Some alleles are neither dominant or recessive and many traits are controlled by what?
Each person has two alleles of one particular gene, which controls one particular characteristic, such as a person's blood group. An allele may be either dominant, recessive, or codominant. A dominant allele would dominate the other allele in the chromosomes, meaning only the dominant allele would contribute to an organism's characteristics. An example of this is the A blood group, which is dominant to the O allele. However, if an individual has both A and B alleles, A and B are codominant, as they both exhibit effects on an organism's characteristics (the blood group). This results in an AB blood group - a combination of the effects of two genes!
What are the advantages and disadvantages of outbreeding?
Advantages: Outbreeding often produces offspring of superior quality because it increases homozygosity (the occurrence of two alleles for the same trait at corresponding positions on homologous chromosomes), thereby sharply reducing the risk of deleterious recessive genes being expressed. Crossbreeding is the most common form of outbreeding.
Is Edward's syndrome caused by a recessive gene?
Edward's syndrome is not technically recessive or dominant, because it is not caused by a single gene. Rather it happens due to a trisomy of chromosome 18 (or just of a part of said chromosome). Parent's may be healthy and still have offspring with the syndrome not because its recessive, but because the trisomy arises during meiosis of the gametes. Whatever happens to the gametes affects only the offspring not the carrier parent.
Is it true that recessive alleles are never present when dominant alleles are present?
No, recessive alleles can still be present in an individual's genetic makeup even when dominant alleles are present. In this case, the recessive allele may not be expressed phenotypically, but can still be passed on to offspring.
What alleles will be expressed in your phenotype?
The alleles that will be expressed in your phenotype are the ones that are dominant and determine your physical traits. These dominant alleles will be visible in your appearance, while recessive alleles may be present in your genetic makeup but not visibly expressed.
What are two forms that a gene or allele may take?
A gene or allele may take a dominant form, or a recessive form. If the allele is recessive, the characteristic which is coded for will be exhibited only if both the gene from the male and the gene from the female is recessive. Only one copy of a dominant allele is required to cause expression of the dominant characteristic
What is a trait that needs two factors in order to be expressed?
Actually, it is the recessive.................................................................UR WELCOME! :)
What are the pair of alleles for a trait and how do they determine the expression of that trait?
Alleles are pairs of genes that determine a specific trait in an organism. Each parent contributes one allele, and the combination of alleles determines how the trait is expressed. If the alleles are the same (homozygous), the trait will be expressed in a certain way. If the alleles are different (heterozygous), one allele may be dominant and determine the trait's expression, while the other may be recessive and not expressed.
How do you distinguish between genotype and phenotype heterozygous and homozygous and dominant and recessive?
Genotype is the organism's full heredity information that may or may not be expressed. Actual observed properties are the phenotype. The phenotype is dependent on the genotype. Genes are homozygous when the same allele (form of the gene) inherited from both parents is the same. When different forms of the same gene are inherited from parents, they are heterozygous. Dominance refers to the relation between alleles of a gene. When two alleles of a gene combine, the dominant one then determines the trait that is expressed. In order for a recessive trait to be expressed, both alleles need to be recessive.
How are dominant and recessive genes related?
Dominate them. Recessive alleles do not show in your phenotype unless you have two of the same recessive allele. But if you inherit one dominant and one recessive, it is the dominant that always shows in your phenotype.
What would the alleles of a heterozygous trait look like?
In a heterozygous individual, the alleles for a trait are different. Each allele may be represented by a different letter (e.g., Aa), where one allele is dominant and the other is recessive. The dominant allele is typically expressed in the phenotype, while the recessive allele is not unless the individual is homozygous recessive.
What are inactive alleles?
Inactive alleles are versions of a gene that do not produce a functional protein or have reduced activity due to mutations. These alleles may not contribute to the individual's phenotype or may have a diminished effect compared to active alleles. Inactive alleles can result in genetic disorders or variations in traits.
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.
Principle states that one factor in a pair may prevent the other factor in the pair from being expressed?
This principle is called the principle of dominance. It explains that in a pair of alleles, the dominant allele will be expressed over the recessive allele. So, the dominant factor will prevent the recessive factor from being expressed in the phenotype.
Is the following sentence true or false all genes show simple patterns of dominant and recessive alleles?
False. Blood type genes have two dominant alleles (A and B), and one recessive (O). When a person gets one A allele and one B allele, they then have the blood type AB. Both are expressed equally. In other genes, a dominant allele might not be completely dominant, allowing the recessive allele to be partially expressed.
