Campbell Essential Biology (7th Edition)
7th Edition
ISBN: 9780134765037
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 9, Problem 24BS
Gregor Mendel never saw a gene, yet he concluded that some inherited factors were responsible for the patterns of inheritance he observed in peas. Similarly maps of Drosophila chromosomes (and the very idea that genes are carried on chromosomes) were conceived by observing the patterns of inheritance of linked genes, not by observing the genes directly. Is it legitimate for biologists to claim the existence of objects and processes they cannot actually see? How do scientists know whether an explanation is correct?
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Gregor Mendel never saw a gene, yet he concluded that some inherited factors were responsible for the patterns of inheritance he observed in peas. Similarly, maps of Drosophila chromosomes (and the very idea that genes are carried on chromosomes) were conceived by observing the patterns of inheritance of linked genes, not by observing the genes directly. Is it legitimate for biologists to claim the existence of objects and processes they cannot actually see? How do scientists know whether an explanation is correct?
A graduate student performing studies on mutations in drosophila (fruit flies) discovered a
strain of flies with a silent mutation in the gene controlling the shape of the wings. Further
investigation has shown that this mutation is lethal in flies who are homozygote. Flies that are
homozygote wild type or heterozygote can develop and are able to survive.
What is a silent mutation (in your own words) and propose a hypothesis that could explain
these observations using concepts learned. (a hypothesis is a proposed explanation based on
an observation or observations)
Propose a hypothesis that could explain the following observation.
A graduate student performing studies on mutations in drosophila (fruit flies) discovered a strain of flies with a silent mutation in the gene controlling the shape of the wings. Further investigation has shown that this mutation is lethal in flies who are homozygote. Flies that are homozygote wild type or heterozygote can develop and are able to survive.
Chapter 9 Solutions
Campbell Essential Biology (7th Edition)
Ch. 9 - The genetic makeup of an organism is called its...Ch. 9 - Which of Mendels laws is represented by each...Ch. 9 - Edward was found to be heterozygous (Ss) for the...Ch. 9 - Whether an allele is dominant or recessive depends...Ch. 9 - Prob. 5SQCh. 9 - Prob. 6SQCh. 9 - Prob. 7SQCh. 9 - Prob. 8SQCh. 9 - Adult height in people is at least partially...Ch. 9 - A purebred brown mouse is repeatedly mated with a...
Ch. 9 - How could you determine the genotype of one of the...Ch. 9 - Tim and Jan have freckles (a dominant trait), but...Ch. 9 - Incomplete dominance is seen in the inheritance of...Ch. 9 - Why was Henry VIII wrong to blame his wives for...Ch. 9 - Both parents of a boy arc phenotypically normal,...Ch. 9 - Heather was surprised to discover that she...Ch. 9 - Prob. 17SQCh. 9 - Prob. 18IMTCh. 9 - Prob. 19IMTCh. 9 - For each pair of your homologous chromosomes, one...Ch. 9 - In 1981, a stray cat with unusual curled-back ears...Ch. 9 - Interpreting Data As shown in the Punnett square...Ch. 9 - There are now nearly 200 recognized breeds of dog,...Ch. 9 - Gregor Mendel never saw a gene, yet he concluded...Ch. 9 - Prob. 25BS
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- Read the following passage carefully about some aspects of genetics involving a certain species of Drosophila and then answer the following questions in parts The gene for the production of eye colour in this species of fruit fly can be expressed as either normal red-eyes or as brown-eyes. The allele for the normal red eyes is dominant to that of brown, and is transmitted in normal Mendelian fashion. A gene involved with body colour in this species of fruit fly is located on the non-homologous portion of the X chromosome, and has two alleles, grey and yellow, where the grey allele is dominant to yellow. The two genes are NOT linked. a) Produce a key to clearly show the nature of the alleles associated with the eye colour in this species of Drosophila, and in each case justify your choice of letters and / or style of presentation to best depict the genetics involved. b) State the type of genetics involved in terms of body colour, justifying your answer with the evidence from…arrow_forwardConstruct a genetic map using the following data: A line of drosophila has been constructed with three recessive mutations: sc = loss of thorax bristles ("scute") ec = roughened eye surface ("echinus") vg = vestigial wings The dominant, wild-type version of each allele could be written as vg + or ec+, but we will write them just as "+" for simplicity. P generation: We cross homozygous recessive flies (sc ec vg / sc ec vg) with homozygous dominant (wild-type) flies (+ + + / + + +). F1 generation: All of the flies produced by the parental cross have the dominant (wild-type) phenotype. Genetically, these flies are: (sc ec vg / + + + ). F2 generation: We produce an F2 generation by mating the F1 flies with homozygous recessive flies (sc ec vg / sc ec vg) This cross produces an F2 generation with 8 different phenotypes: All wild type features – 430 echinus – 5 echinus, vestigial – 29 scute – 25 scute, echinus – 44 scute, echinus, and vestigial – 417 scute,…arrow_forwardSeveral Drosophila species with unspotted wings are descended from a spotted ancestor. Would you predict the loss of spot formation to entail coding or noncoding changes in pigmentation genes? How would you test which is the case?arrow_forward
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