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Breed/use only organisms showing the recessive trait for starters. If one of the parents or progenitor lines show the dominant trait then don't use their offspring. If the offspring of one of the oranisims show the dominant trait then remove both the parent of this offspring and this offspring showing the dominant trait from your program.
What else can I help you with?
What is a trait that needs two factors in order to be expressed?
Actually, it is the recessive.................................................................UR WELCOME! :)
Can a individual carry a gene that is not expressed?
not usually, most books fit into the normal genres: mystery, fiction, nonfiction, adventure etc. I believe this person is referring to "genes," not "genres." To answer the question, then: yes, you can have genes that are not expressed. Recessive genes, for example, will not be expressed in heterozygous individuals; they will only be expressed in homozygous recessive individuals. For example; if you have the genotype Aa, the recessive gene - "a" - will not be expressed because the genotype contains a dominant allele, and the dominant allele will always be the one expressed. The only way that the "a" allele will be expressed is, again, if you are homozygous for that recessive gene (your genotype would be aa).
How are recessive trait inherited?
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.
Is tallness a recessive trait?
No, tallness is typically a polygenic trait influenced by multiple genes. It is not determined by a single gene and therefore cannot be categorized as recessive or dominant in the same way that Mendelian traits are.
What is meant by complete dominance?
DefinitionnounA kind of dominance wherein the dominant allele completely masks the effect of the recessive allele in heterozygous condition.SupplementFor instance, an individual carrying two alleles that are both dominant(e.g. AA), the trait that they represent will be expressed. But if the individual carries two alleles in a manner that one is dominantand the other one is recessive, (e.g. Aa), the dominant allele will be expressed while the recessive allele will be suppressed. Hence, theheterozygote (Aa) will have the same phenotypeas that of the dominant homozygote (AA). This condition is called complete dominance.
What types of alleles are expressed only if 2 identical copies exist on the homologs of the offspring?
Two copies of the recessive allele are the only way a recessive trait is expressed phenotypically.
What is a trait that needs two factors in order to be expressed?
Actually, it is the recessive.................................................................UR WELCOME! :)
What is the difference between a dominant trait and a recessive trait?
A dominate trait will most likely take over the recessive.
When is the only time a recessive phenotype can be observed?
A recessive phenotype can only be observed when an individual is homozygous recessive for that trait, meaning they have two copies of the recessive allele. This is because in a heterozygous individual, the dominant allele will mask the expression of the recessive allele.
What is only way a recessive trait will be expressed?
if its 2 recessive allels together.
Can a individual carry a gene that is not expressed?
not usually, most books fit into the normal genres: mystery, fiction, nonfiction, adventure etc. I believe this person is referring to "genes," not "genres." To answer the question, then: yes, you can have genes that are not expressed. Recessive genes, for example, will not be expressed in heterozygous individuals; they will only be expressed in homozygous recessive individuals. For example; if you have the genotype Aa, the recessive gene - "a" - will not be expressed because the genotype contains a dominant allele, and the dominant allele will always be the one expressed. The only way that the "a" allele will be expressed is, again, if you are homozygous for that recessive gene (your genotype would be aa).
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 are recessive trait inherited?
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.
Why do some traits skip a generation?
I like puppies :) Traits 'skip' generations precisely because most traits are not accounted for by a single gene, but by their combination with other genes. There is no brown hair gene, or blue eye gene. These traits may be controlled by recessive genes, so they seem to skip a generation from grandparent to you. For example, if a trait is produced by a recessive gene, one of your parents may be a carrier but not possess the trait (because she inherited a dominant gene that overrode the recessive one). However, when her genes were recombined to produce the ovum from which you grew, and when that combined with your father's DNA, the trait may resurface.
How would you know if you had a dominant gene?
You would know if you had a dominant gene if you exhibit the trait associated with that gene. Dominant genes override recessive genes when inherited, so if you have a dominant gene, you will express the associated trait in your physical appearance or characteristics. A dominant gene will be expressed in the presence of a recessive gene.
What phenotype does an individual with a homozygous recessive genotype exhibit?
For what trait? Phenotype means the way in which a gene is expressed ie hair colour, kidney function, ear shape. Homozygous means that both genes for that trait are the same. A recessive gene is one that would not be the phenotype if there was a dominant gene paired with it. So the individual has genes for a trait that are the same, and thus expressed, but they wouldn't be if they had only one of that gene.
What kind of allele must an organism inherit in order for a recessive trait to show up?
Neither of the parents will be affected. There may not be any one with he disease in either of the parents families (or there might be). Since each parent is a carrier and has a 50/50 chance of passing one copy of the gene to each child 1/4 of the children will not get the gene, 1/2 will be carriers (1 copy) and 1/4 wil be affected (2 copies).
