Loss of function mutations in the BRCA1 tumor suppressor gene dramatically increase the risk of breast, ovarian and prostate cancers. In the general U.S. population, about 1/400 people inherit a mutant BRCA1 allele, but in people of Ashkenazi Jewish descent, the frequency is much higher: about 1/40. Ashkenazis are a subset of all Jewish people, descended from a small group of individuals isolated for a period of time centuries ago by geographic and cultural factors. Based on this information, which of the following Hardy-Weinberg violations seems most likely to explain the higher frequency of BRCA1 alleles in modern day Ashkenazi Jewish people? O Genetic drift (founder or bottleneck effect) O Negative selection against wild type (functional) alleles of BRCA1 in Ashkenazi Jewish people O Inbreeding within the population of Ashkenazi Jewish people O Positive selection on the BRCA1 mutant allele in Ashkenazi Jewish people

Loss of function mutations in the BRCA1 tumor suppressor gene dramatically increase the risk of breast, ovarian and prostate cancers. In the general U.S. population, about 1/400 people inherit a mutant BRCA1 allele, but in people of Ashkenazi Jewish descent, the frequency is much higher: about 1/40. Ashkenazis are a subset of all Jewish people, descended from a small group of individuals isolated for a period of time centuries ago by geographic and cultural factors. Based on this information, which of the following Hardy-Weinberg violations seems most likely to explain the higher frequency of BRCA1 alleles in modern day Ashkenazi Jewish people? O Genetic drift (founder or bottleneck effect) O Negative selection against wild type (functional) alleles of BRCA1 in Ashkenazi Jewish people O Inbreeding within the population of Ashkenazi Jewish people O Positive selection on the BRCA1 mutant allele in Ashkenazi Jewish people

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter12: Genes And Cancer

Section: Chapter Questions

Problem 27QP: Studies have shown that there are significant differences in cancer rates among different ethnic...

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Alzheimer’s is a progressive neurological disorder resulting in dementia and memory loss that occurs in 10% of the US population older than 65. In the 1990s, several researchers showed evidence that the allele of a cholesterol precursor gene, APO E4, increased risk of developing the disorder compared to APO E2 or APO E3. This was especially pronounced if patients carried two alleles of APO E4. However, not all people with APO E4 develop the disorder and some without it will present with Alzheimer's nevertheless. This suggests other genes influence development of the disease. Current research has elucidated dozens of genes that interact with APO E4 pathways in hundreds of ways. As many as 27 of the interactions are epistatic, with some as dominant epistasis and some as recessive epistasis. In addition, some of the gene candidates for non-APO E4 Alzheimer’s have other relationships such as dominant, codominant or incomplete dominant. No reliable cure currently exists for Alzheimer’s…
Alzheimer’s is a progressive neurological disorder resulting in dementia and memory loss that occurs in 10% of the US population older than 65. In the 1990s, several researchers showed evidence that the allele of a cholesterol precursor gene, APO E4, increased risk of developing the disorder compared to APO E2 or APO E3. This was especially pronounced if patients carried two alleles of APO E4. However, not all people with APO E4 develop the disorder and some without it will present with Alzheimer's nevertheless. This suggests other genes influence development of the disease. Current research has elucidated dozens of genes that interact with APO E4 pathways in hundreds of ways. As many as 27 of the interactions are epistatic, with some as dominant epistasis and some as recessive epistasis. In addition, some of the gene candidates for non-APO E4 Alzheimer’s have other relationships such as dominant, codominant or incomplete dominant. No reliable cure currently exists for Alzheimer’s…
Melanoma, 45 Colon cancer, 40 Sarcoma, 45 Breast Lung cancer, 53 cancer, 32 Stomach cancer, 50 Brain cancer, 18 Osteosarcoma, 3 Leukemia, 19 Rhabdomyosarcoma, 14 Answer the following subparts :- A. What do you notice in this pedigree as compared to Rb or BRCA1/2? B. Why do you think that so many cancer types are associated with inherited defects in p53? Please need detailed answer I want to learn please please I will upvote god promise|
. Neurofibromas are tumors of the skin that can arisewhen a skin cell that is originally NF1+/ NF1− losesthe NF1+ allele. This wild-type allele encodes a functional protein (called a tumor suppressor), while theNF1− allele encodes a nonfunctional protein.A patient of genotype NF1+ / NF1− has 20 independent tumors in different areas of the skin. Samplesare taken of normal, noncancerous cells from thispatient, as well as of cells from each of the 20 tumors.Extracts of these samples are analyzed by a techniquecalled gel electrophoresis that can detect variantforms of four different proteins (A, B, C, and D) allencoded by genes that lie on the same autosome asNF1. Each protein has a slow (S) and a fast (F) formthat are encoded by different alleles (for example, ASand AF). In the extract of normal tissue, slow and fastvariants of all four proteins are found. In the extractsof the tumors, 12 had only the fast variants of proteinsA and D but both the fast and slow variants of proteins B and…
Genetic tests that detect mutations in the BRCA1 and BRCA2 oncogenes are widely available. These tests reveal a number of mutations in these genes—mutations that have been linked to familial breast cancer. Assume that a young woman in a suspected breast cancer family takes the BRCA1 and BRCA2 genetic tests and receives negative results. That is, she does not test positive for the mutant alleles of BRCA1 or BRCA2. Can she consider herself free of risk for breast cancer?
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Sickle-cell anemia is an interesting genetic disease. Normal homozygous individials (SS) have normal blood cells that are easily infected with the malarial parasite. Thus, many of these individuals become very ill from the parasite and many die. Individuals homozygous for the sickle-cell trait (ss) have red blood cells that readily collapse when deoxygenated. Although malaria cannot grow in these red blood cells, individuals often die because of the genetic defect. However, individuals with the heterozygous condition (Ss) have some sickling of red blood cells, but generally not enough to cause mortality. In addition, malaria cannot survive well within these "partially defective" red blood cells. Thus, heterozygotes tend to survive better than either of the homozygous conditions. 11% of an African population is born with a severe form of sickle-cell anemia (ss), What percentage of the population will be more resistant to malaria because they are heterozygous (Ss) for the sickle-cell…
Sickle-cell anemia is an interesting genetic disease. Normal homozygous individials (SS) have normal blood cells that are easily infected with the malarial parasite. Thus, many of these individuals become very ill from the parasite and many die. Individuals homozygous for the sickle-cell trait (ss) have red blood cells that readily collapse when deoxygenated. Although malaria cannot grow in these red blood cells, individuals often die because of the genetic defect. However, individuals with the heterozygous condition (Ss) have some sickling of red blood cells, but generally not enough to cause mortality. In addition, malaria cannot survive well within these "partially defective" red blood cells. Thus, heterozygotes tend to survive better than either of the homozygous conditions. 11% of an African population is born with a severe form of sickle-cell anemia (ss), What is the frequency of the dominant allele? Please show your work in order to receive credit.
Sickle-cell anemia is an interesting genetic disease. Normal homozygous individials (SS) have normal blood cells that are easily infected with the malarial parasite. Thus, many of these individuals become very ill from the parasite and many die. Individuals homozygous for the sickle-cell trait (ss) have red blood cells that readily collapse when deoxygenated. Although malaria cannot grow in these red blood cells, individuals often die because of the genetic defect. However, individuals with the heterozygous condition (Ss) have some sickling of red blood cells, but generally not enough to cause mortality. In addition, malaria cannot survive well within these "partially defective" red blood cells. Thus, heterozygotes tend to survive better than either of the homozygous conditions. 11% of an African population is born with a severe form of sickle-cell anemia (ss), What is the frequency of the recessive allele? Please show your work in order