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A honozygous gene will be expressed, but not necessarily because it is dominant; it would be expressed because there is no alternative. If I ask you to pick one of two cards, and they are both the jack of diamonds, what card will you pick?
To know if a gene is dominant you have to find out if it actually will be expressed even when there is a different gene for that trait, with which it is paired.
Wiki User
∙ 14y ago
Wiki User
∙ 9y agoThe dominant allele is not necessarily the most common allele for a few reasons:
1) Variation among populations. Remember that many alleles run in certain populations and not others, so saying an allele is "common" or "uncommon" sometimes only applies to a certain population, and not to the whole human species. For example, the blue eyes gene is rather "common" among northern European populations but rather "uncommon" among, say, African populations.
2) Many diseases are caused by dominant mutations. These are harmful to the organism and keep it from passing on its genes to the next generation, which is another reason a dominant allele for a given trait is less common than the recessive variant. Examples of diseases caused by dominant mutations are achondroplasia (dwarfness), polycystic kidney disease (kidney failure), and familial adenomatous polyplosis (colorectal cancer).
Wiki User
∙ 13y agoIf they are present in the genotype they are expressed. By present I mean X(dominant) x(recessive). They show up if it's Xx or XX. But that's not to say that they're ALWAYS expressed even if their parents both exhibit it (we can assume that the parents are thus heterozygous).
If the parents are Xx and Xx, there's a 1/4 possibility of the offspring being xx.
Wiki User
∙ 13y agoYes, as long as there's a dominant allele in the genotype, that allele will always be expressed
Wiki User
∙ 14y agoDominant alelles are not always the most common, but they are the most probable.
Wiki User
∙ 14y agoNo, an example disproving this is polydactyly (having more than five fingers) is a recessive trait.
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What is the difference between dominant and recessive gene?
There are no such things as dominant and recessive genes. There are only dominant and recessive alleles. Dominant alleles are parts of a gene that present its features over the recessive allele, which is the one that is always masked by the dominant allele. The recessive allele's trait only shows if both of the alleles in a trait are recessive.
What is an interaction between alleles in which both alleles are expressed more or less equally or a blending occurs called?
Those would be called co-dominant alleles.
What are alleles that have an effect on an organisms phenotype?
The presence of more than two alleles for a trait is known as probility. There might be one which is dormant and the others which are recessive.
What is a plant with two dominant or two recessive alleles said to be?
Heterozygous alleles are used to describe the 'parents' when creating a test cross chart. When completing a test cross there is more than comparing alleles, you are really comparing genetics. Heterozygous YY or yy versus Homozygous Yy, is just the first to consider.
How do you know if a gene is dominant or recessive?
A dominant allele expresses itself in every offspring in every generation. A dominant allele expresses itself irrespective of the other allele present along with it. A recessive allele, however is masked by the presence of dominant allele. It can express itself only if the other gene in the allele pair is also recessive. As a result, it is not expressed phenotypically in every generation.
Which genotypes have dominant phenotypes?
The genotypes in which one or more alleles is dominant.
Why are recessive alleles not removed from populations over time?
If the recessive genotype is selected for more often than the dominant genotype, the recessive allele will become more common than the dominant allele in the gene pool.
What is the difference between dominant and recessive gene?
There are no such things as dominant and recessive genes. There are only dominant and recessive alleles. Dominant alleles are parts of a gene that present its features over the recessive allele, which is the one that is always masked by the dominant allele. The recessive allele's trait only shows if both of the alleles in a trait are recessive.
What is the condition in which there's more than one dominant allele?
Codominance is when an organism has two different dominant alleles, so both of them are expressed.When an organism has two identical dominant alleles, it is homozygous.
What is the difference between dominant alleles and recessive alleles?
dominant-appears in first generation recessive-seems to dissapear
What is an interaction between alleles in which both alleles are expressed more or less equally or a blending occurs called?
Those would be called co-dominant alleles.
What are alleles that have an effect on an organisms phenotype?
The presence of more than two alleles for a trait is known as probility. There might be one which is dormant and the others which are recessive.
Why are recessive alleles not always expressed as the phenotype?
recessive alleles get masked to show the difference in a dominant gene and a recessive gene. the dominate genes masks the recessive genes to show that the dominate gene is more dominate or more likely to be the outcome than the reccessive gene but the masked gene is not always recessive.
What happens to A trait controlled by a dominant gene?
yes, if two Bb parents have kids, there is a 3:1 ratio that their children will show a dominant trait (BB Bb Bb bb). For multiple alleles (3 or more) it gets a little more complicated. Some traits, like height, have 1000's of genes affecting them. Consult your biology teacher for more information.Yes. Because to have a dominant trait you can have two dominant alleles or just one dominant and one recessive (because a dominant allele negates the effect of a recessive allele.) To get a recessive trait it takes two recessive alleles as oppose to a dominant trait where it takes only 1 to have a dominant trait. Therefore Dominant traits are more common.
What are dominant species?
Biomass is a measurement of dominance in an ecosystem. A dominant species is a species that has a community impact that is proportional to its biomass. For example an elephant is a dominant species because it has a large biomass and a large impact on its community, by converting dense woodlands to grasslands that burns more readily and allows for necessary disturbance. The higher a species are up on the food chain, the more dominant they are, as they have an impact on the species lower in the food chain.
Is the dominant trait always expressed?
A dominant gene will be expressed if paired with a recessive gene or with a dominant gene for the same trait. For example, the trait for brown eyes (BB) is dominant over blue eyes (bb) - thus an offspring Bb will express brown eyes, just as BB.
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.
