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The expression of antigen A or antigen B in red blood cells requires the help of an H antigen. A recessive mutation (h) that prevents the synthesis of the H antigen also prevents the expression of A and B antigens. This is called the Bombay effect. There is no ill effect in an individual with this mutation, but complications with blood transfusions or parental disputes may arise.
a. Individuals with the Bombay genotype (hh) produce anti-H antigen. How can this be a problem during blood transfusion?
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- The expression of antigen A or antigen B in red blood cells requires the help of an H antigen. A recessive mutation (h) that prevents the synthesis of the H antigen also prevents the expression of A and B antigens. This is called the Bombay effect. There is no ill effect in an individual with this mutation, but complications with blood transfusions or parental disputes may arise. b. Eva’s parents, John and Cher. Are both type AB. John questioned Cher’s fidelity when Eva turnedout to be a type O. Assuming that Cher is indeed loyal to her husband, why did Eva turn out to betype O? Help Cher prove her innocence by showing the possible genotypes of John and Cher. Show alsothe COMPLETE cross that produced Eva.Achondroplasia is a form of dwarfism in humans. It is caused by a mutant allele of the fibroblast growth factor receptor 3 gene ( FGFR3) that produces an overactive protein. Having one copy of the mutant allele results in dwarfism. Two copies of the mutant allele results in death before birth. If a man with Achondroplasia marries a woman who is Sickle Cell Anemia carrier and they have a child together, what is the probability that their child will Achondroplasia AND be a Sickle Cell Anemia carrier? ½ 2/3 ¼ 1 ½ 1/16Colorblindness and hemophilia are both X-linked traits in humans. Explain how a female who has a defective color vision gene on one X chromosome and a defective blood clotting gene causing hemophilia on the other X chromosome can be neither a hemophiliac nor colorblind? Please discuss the effect of Gene dosage compensation in your answer and in your answer describe the molecular process by which this occurs.
- a. The ABO blood groups are controlled by the alleles of a single gene. A very rare example of epistasis is called the Bombay phenotype. If many couples with the genotypes IAIBHh x IAiHh have children, what ABO phenotypic ratio would you expect in their offspring? b. What genetic term (excluding epistasis) can be used to describe the expression of the ABO alleles in the presence of the hh genotype?Albinism is characterized by the lack of a dark pigment called melanin in the hair, skin and eyes. Albinism is caused by the absence of an functioning enzyme called thyrosinase, which is necessary for the synthesis of melanin. Given this bit of information, what can you assume about the heredity pattern of this trait? A) It is caused by a recessive allele of the gene coding for thyrosinase. B) It is caused by a dominant allele of the gene coding for melanin. C) It is caused by a dominant allele of the gene coding for thyrosinase. D) It is caused by a recessive allele of the gene coding for melanin. E) There is not enough information here to tellWhen the expression of alleles are affected by the presence of other genes,such as sickle cell trait carriers that experience symptoms, this is called
- a. What type of plot is this? What do the little dots above the dotted line represent? b. The labels above the peaks represent human gene names involved in ALS. Based on the data shown here, which would be the first gene you'd like to investigate further and why?The drug tamoxifen has been used to treat some types of breast cancer. Suppose even among female patients with the same tumor grade there is variation in responsiveness to tamoxifen. It is also found that this variation is at least partly genetic; his variation is at least partly genetic; women with a relative who had a low responsiveness to the drug are at higher risk of low responsiveness to the drug The target of tamoxifen is a protein called the estrogen receptor. A. Outline how a “candidate gene approach” could be conducted to investigate whether variation in the gene for estrogen receptor affects tamoxifen responsivenessIn mice, the A allele causes agouti fur, the AY allele causes yellow fur and is dominant to the A allele. The homozygous AY AY genotype is lethal. Why is the AYAY homozygous condition lethal? The AY allele lacks an upstream merc gene which is required for normal embryonic development. The AY allele contains a null mutation in the A gene, which is required for normal embryonic development. The yellow pigment produced by A allele is required for survival. The AY allele highly transcribes the merc gene which is lethal in a homozygous AYAY individual. None of the other answers are correct.
- For gain-of-function disorders, which of the following treatment strategies is the be . A. Gene augmentation B.Supply healthy cells . C.Supply normal form of proteins encoded by wild-type allele . D. Gene silencingA representation of the distance between genes or genetic markers is called a?Suppose that you are studying the role of Protein B, which you believe plays a role in regulating PCD/Apoptosis in mice. You create two lines of mutant mice. One (bb) is homozygous for a loss-of-function allele of gene B. The other (Bb) is heterozygous, with one wild-type allele and one loss-of function allele. Initially you pay particular attention to two phenotypes of the resulting mice:(i) The morphology of their paws (see picture) (ii) The size of their brains & shape of their skulls. The bb mice have unusually large brains and unusual protrusions from their skulls. Based on these data, does it appear that Protein B, when present and active, favors or inhibits PCD/Apoptosis?Briefly explain your reasoning. The answer should address both the paw and brain/skull data.