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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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 methylation
In genetic maternal effect, the phenotype of the individual is determined by which of these statements?
A. The sex of the parent who transmits the gene
B. The nuclear genotype of the maternal parent
C. The sex of the individual with only one sex able to express the phenotype
D. Cytoplasmic genes usually located in the mitochondria
E. A combination of environmental factors and the genotype of the individual
D
An epistatic gene A is a gene that is
A at a different location than gene B and that is capable of suppressing gene B
B) very close to gene B and thus they will be passed together to the offspring
at the same location as gene B and thus their expression is similar
far from gene B and can increase the expression of gene B
Chapter 15 Solutions
Study Guide for Campbell Biology
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- A. Deletion of the SOX9 gene leads to sex reversal resulting in a person with karyotype 46XY being phenotypically Explain the genetic basis for this. B. Describe what would happen to the phenotype of a male with a mutation in the gene encoding SF1? Explain your answer.arrow_forwardImagine a scenario in which prenatal testing of a human female fetus indicates that the baby will have a normal XX karyotype but is heterozygous for a mutation that inactivates the Xist promoter. Allele “Xr” represents the mutated version of the Xist promoter, and “XR” represents the normal version of the Xist promoter. How will this mutation affect the process of X inactivation?A. "X inactivation will still be random with both mutant and normal X chromosomes being randomly inactivated" B. "The chromosome with the mutant Xist promoter will always be active" C. "The chromosome with the mutant Xist promoter will always be inactivated" D. "The normal X chromosome (no mutation in Xist) will always be active" E. "The normal X chromosome (no mutation in Xist) will always be inactivated"arrow_forwardAt birth a child has got blue eyes, but now his/her eyes turn brown. Which of the following statements would best explain the observed phenomena? A. The child does not have brown pigment at birth B. Eye’s colour at birth is affected by mother’s gene C. Gene repressor for brown pigment produced is not yet active D. Gene activatior for brown pigment production is not yet active at birth E. All of the above statements are falsearrow_forward
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- 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.arrow_forwardWhich of the following scenarios best describes an epistatic gene? Select one: a. Fur pattern is controlled by two genes such that one gene inhibits the expression of the other gene. b. Chicken combs follow a dominance hierarchy whereby a walnut comb is the most dominant and a single comb is the least dominant. c. Individuals with sickle cell anemia and carriers of the sickle cell allele have some resistance to malaria. d. Mouse fur colours are expressed as a blend of the dominant black colour and the recessive white colour, resulting in a heterozygous brown colour.arrow_forwardIn mammals, males have X and Y sex chromosomes, while females have two Xs. While the Y sex chromosome has very few genes associated with it, the X sex chromosome has many that are important to maintain life. How do mammals account for this in terms of equaling out gene expression levels? A. Mammals do not need to account for this, but birds do. B. Females produce more proteins from X-linked genes than males do. C. The single X of the males works twice as hard to keep up with the female’s two Xs. D. The females have one X inactivated to permit the males to keep pace with them.arrow_forward
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