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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Chapter 15, Problem 15TYK
Summary Introduction
Introduction: Behavioral inhibition is a temperament that is linked to the development of social anxiety disorder. It is described as a tendency to respond to situations with shy and restraint or timid responses.
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Nondisjunction can happen in males and females. It has been found to correlate with advanced maternal age but not paternal age. Why is that?
A.
Because estrogen promotes non-disjunction.
B.
Because oogenesis has a prolonged prophase and is more prone to have errors with maternal age.
C.
Because more mutations can happen in females.
D.
All of the above.
Fruit flies are very useful model organisms that have been used to study genetics. One mutant recessive trait in fruit flies is called "eyeless" because it causes flies to have no eyes. Cross an eyeless fly with a homozygous normal fly.
a. Draw the Punnett square.
b. What is the genotyoe ratio of the offspring?
c. What is the phenotype ratio of the offspring?
d. What genetic problem is this? (monohybrid, dihybrid or multiple allele)
Which observation led Thomas Morgan to realize that the gene for fruit fly eye color was located on a sex chromosome?
a.
He noticed that only male F2 flies could have white eyes; no females displayed this trait.
b.
He saw that the F2 generation of flies had the classic 3:1 phenotypic ratio of red eyes to white eyes
c.
He read it in a biology textbook
d.
He noticed that only mutant flies had white eyes
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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- Color blindness in men is controlled by a recessive gene located on the X chromosome. Can a brother and sister with color blindness have another normal brother? A. Yes, if the mother is a carrier. B.Yes, if the mother is homozygous. C.Yes, if the father is heterogametic. D.Yes, if the father is a carrier.arrow_forwardIn organisms with X and Y chromosomes, many more genes can be found on the X chromosome than on the Y chromosome. In mammals, how might this deviate from traits being expressed, according to Mendel? A. Females might exhibit a mix of traits rather than all dominant or all recessive traits. B. Only females will have the traits resulting from the X-linked genes. C. Females will overproduce some proteins in relation to males’ production levels. D. This will not result in individuals deviating from Mendel’s principles.arrow_forwarda. Why males and females do not show equal chances of inheriting a trait? b. Is it possible to determine the genotypes of the parents based on the phenotypes of the offspring?arrow_forward
- Scurs in cattle is a sex-influenced trait. A cow with no scurs whosemother had scurs had offspring with a bull with scurs whose fatherhad no scurs. What are the probabilities of each of the followingcombinations of offspring? A. The first offspring will not have scurs.B. The first offspring will be a male with no scurs.C. The first three offspring will be females with no scursarrow_forwardWhich statement best describes the reason maternal recessive CYP1A1 polymorphisms of CYP1A1 decrease birth weight in children of smokers? Answer choices (a) It reduces the metabolism of nicotine (b) It increases the metabolism of nicotine (c) It reduces the metabolism of PAHs (d) It increases the metabolism of PAHsarrow_forwarda. Determine if the pedigree below can be for a trait that is X-linked traits. Write the genotype of each individual next to the symbol. b. Is it possible that this pedigree is for an X-linked recessive trait? c. What can you conclude about the children if both parents are affected with an X-linked recessive trait?arrow_forward
- Do the conclusions "all affected parents should have all affected offspring" for autosomal recessive traits apply to X-linked recessive traits? Explain your answer.arrow_forwardTwo pea plants that are true-breeding for recessive white flowers are mated and their offspring analyzed. Which of the following statements about this situation is true? Group of answer choices A)The offspring represent the P generation. B)The gametes produced by the offspring will carry only one allele for this gene. C)Both parents are referred to as heterozygotes. D)Half of the offspring will be true-breeding for white flowers.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
- What was the hypothesis of the X-linked cross conducted in the lab (between white-eyed female and re-eyed male) with the white mutation in Drosophila and written up in your lab report? A All female offspring will inherit red eyes from their mother because the mutation is X linked recessi B All female offspring will inherit white eyes from their mother because the mutation is X linked recessive. C All male offspring will inherit white eyes from their mother because the mutation is X linked recessive. D All male offspring will inherit red eyes from their mother because the mutation is X linked recessive. E All male offspring will inherit white eyes from their mother because the mutation is X linked dominant.arrow_forwardWhich of the following findings supports the fact that the presence of the Y-chromosome rather than the lack of a second X-chromosome determines the development of maleness in mammals? a. A human with an X0 genotype (Turner syndrome) is phenotypically female. b. A human with an XXY genotype (Klinefelter syndrome) is phenotypically male. c. A transgenic mouse with two X-chromosomes and the SRY gene from the Y-chromosome develops male sex organs. d. b and c, but not a e. a, b, and carrow_forwardHow is this trait inherited? A. The trait is epistatic. B. The trait is X-linked. C. The trait is dominant. D. The trait is recessive.arrow_forward
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