Is hemophilia a polygenic inheritance
A:Yes, hemophilia is a rare, inherited bleeding disorder in which your blood doesn’t clot normally. If you have hemophilia, MORE? [ Source: http://www.chacha.com/question/is-hemophilia-a-polygenic-inheritance ]
More Answers to “Is hemophilia a polygenic inheritance“
- Is hemophilia a polygenic inheritance
- Yes, hemophilia is a rare, inherited bleeding disorder in which your blood doesn’t clot normally. If you have hemophilia, MORE?
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- Need help with Biology questions, due tomorrow please help.?
- Q: 1. Many traits, such as stem length, are controlled by multiple genes. This is calledA. Simple Dominant Inheritance B. Monogenic InheritanceC. Polygenic inheritance D. Codominance2. Which of the following traits is mediated by X-linked inheritance?A. Hemophilia B. Sickle-Cell AnemiaC. Blood Type D. None of the above3. A chart of an individual’s chromosome pairs is called a karyotype. Analysis of a karyotype can reveal which of the following?A. Phenotype B. GenotypeC. Trisomy D. All of the above 4. A couple has a child who, with respect to a specific trait, resembles neither parent. Which of the following is NOT a possible mechanism for this trait.A. Simple Recessive Heredity B. CodominanceC. Incomplete Dominance D. Simple Dominant Heredity
- A: 1.C2.A3.C4.D
- For everyone who is good at science, these sentences don’t make sense to me, and I really need to understand.
- Q: Ok here they are. Please explain them to me as simple as possible.1. The allele for hemophilia is on the X chromosome and is a sex-linked gene.2. Polygenic inheritance occurs when a group of gene pairs acts together to produce a single trait.3. In incomplete dominance both alleles are expressed in offspring.
- A: 1. “sex-linked” genes are those found on the X or the Y chromosome, as those are the chromosomes that dictate what gender you will be: if you have two X chromosomes, you’re female, if you have 1 X and 1 Y, you are male.The Y chromosome is almost “genetically empty”, having very few genes. Normally, if you have a defective gene that is recessive, you need to have two defective copies of it for the trait to be expressed: if you only have one defective copy, then the other “wild-type” allele on the partner chromosome will make-up for the defective version, and you’ll have a normal phenotype (though you will still be a “carrier” for the gene). An example of this is Cystic Fibrosis, where you need both alleles of the gene to be the diseased version before you actually have cystic fibrosis: if you have one normal chromosome, you are fine – but you still might give the disease to your children.If the gene in question is on the X chromosome, and you are male, then you don’t have a compensating partner chromosome. So even if the trait is recessive, you’ll have the disease. If you are female, you *do* have another X chromosome, and will need both copies to be defective – same as any other recessive trait. In haemophilia, therefore, females are much less likely to have the disease: they’d need a mother who was a carrier, *and* a father with the disease in order to display the disease. Males, OTOH, can get the disease by inheriting it from their mother if she is a carrier, as their Y chromosome cannot compensate.2. A good example of a polygenic trait is eye colour. Eye colour is coded for by several different genes: there are many different pigments that can be expressed in the eye, there is how thick or thin your iris is, and so on. All of these different traits – which are coded for by different genes – will combine to produce just one feature: the colour of your eyes.3. As well as the simple Dominant vs Recessive allele types, you can also get Incomplete Dominance and Codominance.Incomplete dominance is where the dominant allele does not compensate 100% for the recessive trait. The classic example here is snapdragons, which can be red (RR) or white (rr). If you cross red and white snapdragons, the offspring will be Rr, but they’re not red – instead they are pink, as they only make half as much pigment as the red flowers.Codominance is like human blood types, and is where two dominant alleles are both expressed AT THE SAME TIME. So A type blood and B-type blood are both dominant over O-type blood: you can be A-type with a genotype of AA or Ao, and B-type with BB or Bo, but only oo produces O-type blood. But if you have an AB genotype, then both the A and the B antigens are made, and your blood type is AB.
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- Q: When roan cattle are mated, 25% of the offspring are red, 50% are roan, and 25% are white. Upon examination, it can be seen that the coat of a roan cow consists of both red and white hairs. This trait is one controlled by _____. multiple allelescodominant allelessex-linked genespolygenic inheritanceEye color in humans is the result of _____ inheritance. multiple allelicpolygenicsex-linkedsimple dominantRoyal hemophilia is the result of _____ inheritance.multiple allelicpolygenicsex-linkedsimple dominant A child is diagnosed with a rare genetic disease. Neither parent has the disease. How might the child have inherited the disorder?The disorder is dominant and was carried by a parent.The disorder is recessive and carried by both parents.The disorder is sex linked and inherited only from the father.The disorder could occur only as a mutation in the child because neither parent had the disease. A phenotypic trait that results from a single dominant allele is _____. attached earlobesmore frequent in its appearancecystic fibrosispolydactyly Which of the following genetic disorders can be detected by karyotyping? Down syndromeTay-Sachs disease and phenylketonuriahemophilia and cystic fibrosisKlinefelter syndrome and sickle-cell anemia
- A: 1.codominant alleles2.Eye color in humans is the result of -Polygenic inheritance,3. Royal hemophilia is the result of sex-linked4. A child is diagnosed with a rare genetic disease. Neither parent has the disease. How might the child have inherited the disorder?-I think it’s recessive and carried by both parents. Both parents have only one copy of the gene, so, they don’t have it, but are carriers. A child gets half his or her genes from each parent. If the child gets the bad gene from each parent, the child will have the disease. There is a 25% chance of this happening with every child these parents have. 5. A phenotypic trait that results from a single dominant allele is – polydactyly6. Which of the following genetic disorders can be detected by karyotyping? -Down Syndrome, Klinefelter Syndrome