5. Construct a gene map given the following informa Which two genes are most likely going to be inherite together? Genes Crossover Frequency А & C 8% A & D 10% B & D 14% В & F 8% C & D 2% C & F 8% D & F 6%
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- 1. The first genetic test used a short DNA sequence that was closely linked to the Huntington’s locus. People taking the test were classified as to whether they had the DNA sequence that was linked to the Huntington’s disease. This method was 95% accurate. This means that 95% of the people who had the Huntington’s-linked DNA sequence actually inherited the Huntington allele. It also meant that 95% of the people who did not have the DNA sequence linked to the Huntington allele did not inherited the wild-type allele (not the Huntington allele).Why might this preliminary test not be as accurate as a gene test for the actual Huntington’s allele? Explain.2. Anyone who inherits a single copy of the Huntington’s allele will get Huntington’s disease, if they live long enough. The age of onset of Huntington’s symptoms for those who inherit the disease allele can vary, starting in the patients’ 40s, 50s, or 60s. What is the genetic term for this variation in symptoms and in their time of appearance?2. A husband and wife both have normal skin pigmentation. Their first child is albino. Give the genotypes of the parents and of the albino child. Give the genotypes of the parents and of the albino child. What is the chance that if they have a second child, this child will not be albino? what is the chance that if they have a third child, this child will be albino? 3. translate the following sequence of messenger RNA nucleotides in a sequence of amino acids forming part of a polypeptide chain a. C-U-G-U-U-U-U-G-C-A-G-U-G-G-U-U b. write the sequence of nucleotides for the portion of a DNA molecule that served as a pattern or template for the formation of the messenger RNA above. c. A certain protein contains the following sequence of amino acids: isoleucine-serine-arginine-glutamic acid-serine-proline-valine-glutamic acid. Using the table found in your text, write the sequence of RNA triplet that would code for this sequence of amino acids. then write the sequence of DNA triplets that…
- Discuss Concepts Many human diseases are caused by recessive alleles that are not expressed in heterozygotes. Some people think that eugenicsthe selective breeding of humans to eliminate undesirable genetic traitsprovides a way for us to rid our populations of such harmful alleles. Explain why eugenics cannot eliminate such genetic traits from human populations.Variation in _____ is the basis of variation in traits. a. karyotype b. the DNA sequence c. the double helix d. chromosome numberThe photos above show flowers from Arabidopsis plants. One plant is wild-type (unmutated); the other carries a mutation in one of its ABC floral identity genes. This mutation causes sepals and petals to form instead of stamens and carpels. Refer to Figure 10.8 to decide which gene (A, B, or C) has been inactivated by the mutation.
- Imagine you are trying to test whether a population of flowers is undergoing evolution. You suspect there is selection pressure on the color of the flower: bees seem to cluster around the red flowers more often than the blue flowers. In a separate experiment, you discover blue flower color is dominant to red flower color. In a field, you count 600 blue flowers and 200 red flowers. What would you expect the genetic structure of the flowers to be?How does the regulation of gene expression support continued evolution of more complex organisms? Cells can become specialized within a multicellular organism Organisms can conserve energy and resources Cells grow larger to accommodate protein production Both A and B.DNA _____. a. guides form and function b. is the basis of traits c. is transmitted from parents to offspring d. all of the above
- The ability of humans to taste the bitter chemical phenylthiocarbamide (PTC) is a genetic trait. People with at least one copy of the normal, dominant allele of the PTC gene can taste PTC; those who are homozygous for a mutant, recessive allele cannot taste it. Could two parents able to taste PTC have a nontaster child? Could nontaster parents have a child able to taste PTC? A pair of taster parents, both of whom had one parent able to taste PTC and one nontaster parent, are expecting their first child. What is the chance that the child will be able to taste PTC? Unable to taste PTC? Suppose the first child is a nontaster. What is the chance that their second child will also be unable to taste PTC?1. What is an open-ended question about how traits exist in families and the importance of the genotype and phenotype of traits? This can be anything related to genetics. 2. Explain why it is an important question to ask.4. Marfan syndrome is a genetic trait caused by in a dominant allele. The trait causes a weakening of the aorta that can be fatal. A teenager whose mother has the syndrome (but whose maternal grandfather was not affected), and whose father was unaffected, is concerend that she may have the trait. a. What is the phenotype of each of her parents? Genotype? b. What is the chance that the teenager has Marfan syndrome?