AnswersDriveThis isn't always the case and there is no reason it should be. Whether or not a trait is common has to do with how many copies of that gene version (or allele) are in the population. It has little or nothing to do with whether the trait is dominant or recessive. Let's take eye color as an example.
Keeping this in consideration, is a cleft chin a dominant trait?
This is an inherited trait in humans, where the dominant gene causes the cleft chin, while the recessive genotype presents without a cleft. However, it is also a classic example for variable penetrance with environmental factors or a modifier gene possibly affecting the phenotypical expression of the actual genotype.
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What are the dominant traits?
These are some of the common dominant and recessive traits in humans that can be easily observed in people around you.
- Widow's Peak. A widow's peak or the mid-digital hairline is due to expression of the gene for hairline.
- Bent Pinkie.
- Earlobe Attachment.
- Rolling of Tongue.
- Cleft Chin.
- Dimples.
- Handedness.
- Natural Curly Hair.
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Are all traits controlled by a single gene?
Multiple genes, not just a single gene, determine most traits in humans such as height, eye color, and skin color. When a trait is controlled by more than one gene it is called polygenic.
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Can a single gene can control a single trait?
I. A single gene can control a single trait. II. A single gene can influence multiple traits. A single trait can be controlled by multiple genes.
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What is an example of dominant and recessive traits?
Freckles, cleft chin and dimples are all examples of a dominant trait. Having almond-shaped eyes is a dominant trait whereas having round eyes is a feature controlled by recessive alleles. The trait of detached earlobes, as opposed to attached earlobes, is dominant.
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Are traits controlled by dominant alleles are more common than traits controlled by recessive alleles?
Individual alleles control the inheritance of traits. Some alleles are dominant, while other alleles are recessive. A dominant allele is one whose trait always shows up in the organism when the allele is present. A recessive allele is masked, or covered up, whenever the dominant allele is present.
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Why are most of the well known genetic diseases caused by recessive alleles?
Autosomal recessive genetic disorders, such as cystic fibrosis, are caused by recessive alleles of a single gene on an autosome. Autosomal dominant genetic disorders, such as Huntington's disease, are caused by dominant alleles of a single gene on an autosome.
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What does it mean that a trait is determined by multiple alleles?
We inherit half of our genes (alleles) from ma, & the other half from pa, so we end up with two alleles for every trait in our phenotype. An excellent example of multiple allele inheritance is human blood type. Blood type exists as four possible phenotypes: A, B, AB, & O.
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How genes are expressed?
Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product. These products are often proteins, but in non-protein coding genes such as transfer RNA (tRNA) or small nuclear RNA (snRNA) genes, the product is a functional RNA.
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Why are recessive traits more common in males?
X-linked recessive inheritance is a mode of inheritance in which a mutation in a gene on the X chromosome causes the phenotype to be expressed in males (who are necessarily hemizygous for the gene mutation because they have one X and one Y chromosome) and in females who are homozygous for the gene mutation, see
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What is an example of a single gene trait?
Several human traits may be used to demonstrate the individuality in humans. They are controlled by a single gene with two alleles; each allele producing a distinct phenotype. Alleles are different expressions of the same gene.
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What is the combination of alleles?
Considering the alleles of a gene present in an organism and the physical results, brings us to the terms genotype, phenotype, and trait. An organism's genotype is its specific combination of alleles for a given gene.
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Is it possible to determine the genotype of an individual who has a dominant phenotype?
It is possible to determine the genotype of an individual expressing a dominant allele by crossing with a homozygous recessive individual. A punnett square also allows you to determine the chances or probability that an offspring will have a particular genotype/phenotype.
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What is the difference between a homozygous and heterozygous individual?
Blood type is determined by three different alleles: A, B, and O. The O allele is recessive and the A and B alleles are co-dominant. A homozygous individual will have one of the following genotypes, AA, BB, or OO. A heterozygous individual will have an AO, BO, or AB genotype.
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What is an example of homozygous?
Homozygous is a word that refers to a particular gene that has identical alleles on both homologous chromosomes. It is referred to by two capital letters (XX) for a dominant trait, and two lowercase letters (xx) for a recessive trait.
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What is the dominant allele?
n an allele that produces the same phenotype whether its paired allele is identical or different. Synonyms: dominant Type of: allele, allelomorph. (genetics) either of a pair (or series) of alternative forms of a gene that can occupy the same locus on a particular chromosome and that control the same character.
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What does it mean to be a dominant allele?
Recessive and dominant alleles. You will recall that genes have different forms called alleles. An allele can be recessive or dominant. A recessive allele only shows if the individual has two copies of the recessive allele.
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Is Hemophilia A dominant or recessive trait?
The gene with the instructions for making factor is found only on the sex chromosome labeled X. If the gene is faulty, the result is hemophilia unless there is a dominant, normal gene on a matching X chromosome. Hemophilia is a sex-linked recessive disorder.
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Is color blindness a dominant or recessive trait?
The most common type of red-green color perception defect is due to a mutation on the X-chromosome (i.e. a red-green color blind allele). X-linked red-color blindness is a recessive trait. Females heterozygous for this trait have normal vision.
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Can a woman be a hemophiliac?
Thus, males can have a disease like hemophilia if they inherit an affected X chromosome that has a mutation in either the factor VIII or factor IX gene. Females can also have hemophilia, but this is much rarer. In such cases both X chromosomes are affected or one is affected and the other is missing or inactive.
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Is a cleft chin a dominant or recessive trait?
This is an inherited trait in humans, where the dominant gene causes the cleft chin, while the recessive genotype presents without a cleft. However, it is also a classic example for variable penetrance with environmental factors or a modifier gene possibly affecting the phenotypical expression of the actual genotype.