Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 20, Problem 7PDQ
List the main classes of zygotic genes. What is the function of each class of these genes?
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The phenotype of a heterozygous mouse (Aa) is agouti. The agouti banding pattern is due to altered expression of the agouti gene. Which of the following statement is false?
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b) Evidence suggests that the agouti gene is only expressed in tissues associated with fur production.
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d) All of the above
Our understanding of maternal effect genes has been greatly aided by their identification in experimental organisms such as Drosophila melanogaster and Caenorhabditis elegans. In experimental organisms with a short generation time, geneticists have successfully searched for mutant alleles that prevent the normal process of embryonic development. In many cases, the offspring die at early embryonic or larval stages. These are called maternal effect lethal alleles. How would a researcher identify a mutation that produced a recessive maternal effect lethal allele?
Chapter 20 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 20 -
CASE STUDY |One foot or another
In humans the...Ch. 20 - CASE STUDY| One foot or another In humans the HOXD...Ch. 20 - CASE STUDY| One foot or another In humans the HOXD...Ch. 20 - HOW DO WE KNOW? In this chapter, we have focused...Ch. 20 - Review the Chapter Concepts list on page 403. Most...Ch. 20 -
3. Nuclei from almost any source may be injected...Ch. 20 -
4. Distinguish between the syncytial blastoderm...Ch. 20 - (a) What are maternal-effect genes? (b) When are...Ch. 20 - (a) What are zygotic genes, and when are their...Ch. 20 - List the main classes of zygotic genes. What is...
Ch. 20 -
8. Experiments have shown that any nuclei placed...Ch. 20 - How can you determine whether a particular gene is...Ch. 20 -
10. You observe that a particular gene is being...Ch. 20 - What are Hox genes? What properties do they have...Ch. 20 -
12. The homeotic mutation Antennapedia causes...Ch. 20 - The Drosophila homeotic mutation spineless...Ch. 20 - A number of genes that control expression of Hox...Ch. 20 - In Arabidopsis, flower development is controlled...Ch. 20 - Prob. 16PDQCh. 20 - Dominguez et al. (2004) suggest that by studying...
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- What is a heterochronic mutation? How does it affect the phenotypic outcome of an organism? What phenotypic effects would you expect if a heterochronic mutation affected the cell lineage that determines the fates of intestinal cells?arrow_forwardDiscuss the following types of mutations, with reference to specific genetic disorders: i) Chromosomal deletion; ii) Reciprocal translocation; and iii) Haploinsufficiencyarrow_forwardWhat is a homolog? With regard to genes and alleles, how arehomologs similar to and different from each other?arrow_forward
- What are paralogous and orthologous genes? What are some of the explanations for the finding that humans are a much more complex organism than the roundworm C. elegans, yet have only about 5 percent more protein- coding genes (21,000 versus 20,000)?arrow_forwardIf in an offspring there is a "zigzag" segregation for the [y] mutant phenotype (recessive mutation) after crossing pure strain Drosophila: a) this indicates that the gene is carried on the Y chromosome b) no correct answer c) this indicates that the mother expressed the [y] mutant phenotype this indicates that it is a holandric gene d) e) this indicates that the gene is carried by an autosome f) this indicates that the father expressed the [y] mutant phenotype g) it indicates that the gene is carried by the W chromosome h) this indicates that the gene is carried on the X chromosome i) this indicates that the gene is sex-linkedarrow_forwardThe normal sequence of markers on a certain Drosophila chromosome is ABCDE*FGHIJK, where the asterisk represents the centromere. Some flies were isolated with a chromosome aberration that has the following structure: ABCDE*FIJK . This represents a O a) deletion of GH segment O b) inversion of GH segment O c) deletion O d) deletion of centromerearrow_forward
- What are Extranuclear genes?arrow_forwardThe easily observed external structures in insects, such as different pairs of legs, antennae, and wings form from imaginal discs. a.) How is the identity of the different Drosophila imaginal discs established in the embryo—for example, how is it determined whether a disc will form a wing, a leg, or some other structure? b.) Dominant mutants in the gene Antennapedia result in fore legs forming in the location where antennae are expected. How does this mutant phenotype illustrate your response to Part a?arrow_forwardWhat is the relationship between linked genes and syntenic genes? Are syntenic genes always linked? Are linked genes always syntenic? Describe what is meant by each termarrow_forward
- 1) In the plant Salvia, two genes determine the inheritance of flower colour. For one gene, P is the allele for purple colour and p for pink. However, at least one dominant allele at the other locus is required for the colour to be expressed, Plants with the genotype aa have white flowers. Write down all possible genotypes for a) purple flowered b) pink flowered c) white flowers d) which gene, A/a or P/p is the epistatic gene and which is the hypostatic gene? e) What type of epistasis is this?arrow_forwardDetermination of phenotypic sex in fruit flies is controlled by: A) alternative splicing B) DNA methylation C) RNA interference D) The CRIPSR mechanism Give typing answer with explanation and conclusionarrow_forwardWhat type of epigenetic change is responsible for genomic imprinting?arrow_forward
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