Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Textbook Question
Chapter 15, Problem 13TYK
Genomic imprinting
- a. explains cases in which the
phenotypic effect of an allele depends on the sex of the parent from whom that allele is inherited. - b. may involve the silencing of an allele by methylation such that offspring inherit only one active copy of a gene.
- c. occurs more often in females because of the larger maternal contribution of cytoplasm.
- d. involves both a and b.
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1A. What is the molecular basis for genomic imprinting?
B. How is the process of X-chromosome inactivation similar to genomic imprinting.
C. How is the process of X-chromosome inactivation different from genomic imprinting.
D. In mice, the Igf2 gene inherited from the mother is never expressed in her offspring? Explain.
E. What genes are deleted in a female born with Angelman syndrome. Which parent transmitted the deletion to her?
1.a) With the aid of annotated diagrams differentiate between incomplete dominance, complete dominance and codominance
b) List and explain the 5 modes of inheritance in pedigree analysis
c) With the aid of illustrative diagrams explain the three theories of DNA replication
d) Discuss the impact of COVID-19 pandemic on ecosystems.
a. What is the Raly gene? What does it encode? How does it relate to the lethality of Ay?
b. A heterozygous mouse AAy does not produce enough pigment and it is yellow. Homozygous individuals die during development, but AAy heterozygous do not. Why? You may use any graphic aid to explain this, if necessary. This means that you may use a Punnett square or a forking segregation diagram, or computations with fractions.
c. Explain why there is a non-Mendelian 2:1 yellow/agouti phenotypic ratio in this cross.
Chapter 15 Solutions
Study Guide for Campbell Biology
Ch. 15 - Complete the following summary of Morgans crosses...Ch. 15 - Two normal color-sighted individuals have two...Ch. 15 - In a testcross between a heterozygote tall,...Ch. 15 - With unlinked genes, an equal number of parental...Ch. 15 - The following recombination frequencies have been...Ch. 15 - a. What is the difference between an organism with...Ch. 15 - Prob. 7IQCh. 15 - Prob. 8IQCh. 15 - Mendels law of independent assortment applies to...Ch. 15 - You have found a new mutant phenotype in fruit...
Ch. 15 - Prob. 3SYKCh. 15 - Prob. 4SYKCh. 15 - Thomas Hunt Morgan firmly established the location...Ch. 15 - Prob. 2TYKCh. 15 - Sex-linked traits a. are coded for by genes...Ch. 15 - Prob. 4TYKCh. 15 - Prob. 5TYKCh. 15 - Prob. 6TYKCh. 15 - Prob. 7TYKCh. 15 - Prob. 8TYKCh. 15 - Prob. 9TYKCh. 15 - Prob. 10TYKCh. 15 - Consider three genes on the X chromosome: A, B,...Ch. 15 - Prob. 12TYKCh. 15 - Genomic imprinting a. explains cases in which the...Ch. 15 - Prob. 14TYKCh. 15 - Prob. 15TYKCh. 15 - Suppose that alleles for an X-linked character for...Ch. 15 - Some girls who fail to undergo puberty are found...Ch. 15 - Prob. 18TYKCh. 15 - The genetic event that results in Turner syndrome...Ch. 15 - Prob. 20TYKCh. 15 - Prob. 1GPCh. 15 - Prob. 2GPCh. 15 - Prob. 3GPCh. 15 - Prob. 4GPCh. 15 - Prob. 5GPCh. 15 - Red-green color blindness is caused by a...
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- The case of golden labs in which a mutation in a gene for the pigment transport protein results in a lack of pigment (the golden color) instead of the brown or black the results from the actual pigment genes, is an example of... Select one: a. multiple alleles b. epistasis c. genomic imprinting d. altered methylationarrow_forwardSuppose 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.arrow_forwardMolecular geneticists have performed experiments in which they altered the number of copies of the bicoid gene in flies, affecting the amount of Bicoid protein produced. a. What would be the effect on development of an increased number of copies of the bicoid gene? b. What would be the effect of a decreased number of copies of bicoid? Justify your answers.arrow_forward
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- Red–green color blindness in humans is due to an X-linked recessive gene. A woman whose father is color blind possesses one eye with normal color vision and one eye with color blindness. a. Propose an explanation for this woman’s vision pattern. Assume that no new mutations have spontaneously arisen. b. Would it be possible for a man to have one eye with normal color vision and one eye with color blindness?arrow_forwardWhen mice carrying the Avy allele exhibit a darker coat, thisphenotype is thought to be caused by dietary factors thatresult ina. a greater level of DNA methylation and a decrease in theexpression of the Agouti gene.b. a lower level of DNA methylation and a decrease in theexpressionof the Agouti gene.c. a greater level of DNA methylation and the overexpressionof the Agouti gene.d. a lower level of DNA methylation and the overexpression ofthe Agouti gene.arrow_forwardTwo plants with white flowers, each from true-breeding strains, were crossed. All the F1 plants had red flowers. When these F1 plants were intercrossed, they produced an F2 consisting of 177 plants with red flowers and 142 with white flowers. (a) Propose an explanation for the inheritance of flower color in this plant species. (b) Propose a biochemical pathway for flower pigmentation and indicate which genes control which steps in this pathway.arrow_forward
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