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 7TYK
Summary Introduction
Introduction: Locus is the specific location of a gene in a chromosome. The inheritance of two different characters is affected by the gene linkage. The production of the offspring with traits that are combined is studied in recombination. Map units measure genetic linkage.
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Students have asked these similar questions
Blue snorks are dominant to pink snorks. You come across a field of all blue snorks and mate them with a pink snork. The resulting progeny are all blue again. What are the most likely genotypes of the snorks from the field?
Select one:
a. Heterozygous for the dominant allele.
b. Homozygous for the dominant allele.
c. Homozygous for the recessive allele.
During a dihybrid cross involving two linked genes (two-point testcross), 20 flies showed recombinant phenotypes, whereas 480 flies showed the parental phenotypes. How far apart are these linked genes from each other?
a. 20 cM
b. 7.5 cM
c. 4 cM
d. 0.04 cM
e. 8 cM
As a biologist, you complete a test cross between fly offspring to gain information about how two genes interact. You find that 20% of these test cross offspring are parental types and 80% are recombinant types. Which of the following is true based on these results?
a.
The alleles of the genes in question did not go through independent assortment
b.
The genes in question are likely located on different chromosomes
c.
There is a 100% frequency of recombination in this test cross
d.
Most of the test cross offspring look like their parents
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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- Let us suppose that two long-winged flies were crossed and that 77 long-winged and 24 short-winged specimens were counted in the offspring. a. Will the short-winged character be dominant or recessive?B. What will the genotypes of the parents be?C. What is the observed genotype ratio?arrow_forwardA gene for corn has two alleles, one for yellow kernels and one for white kernels. Cross pollination of yellow corn and white corn results in ears of corn that have an approximately even mix of yellow and white kernels. Which term best describes the relationship between the two alleles? Choose 1 answer: A. Genetic recombination B. Codominance C. Incomplete dominance D.Chimerismarrow_forwardThe mating below shows the sex chromosome found in two parents and their resulting offspring. Use this family information to answer the following questions. Xfmr1 Y x Xfmr1 XFMR1 → XFMR1 XFMR1Y How many Barr bodies would the child have? a. 3 b. 2 c. 1 d. 0 e. Cannot be determinedarrow_forward
- An organism that has two different alleles for a single trait is said to be for that trait. Select one: O O O a. heterologous b. heterozygous c. homozygous d. haploid e. diploidarrow_forwardIn the previous question (see text below if unsure) what is the frequency of the different genotypes? You cross organisms with genotypes AaBb to one another (i.e. AaBb X AaBb). What are the genotypes of gametes that these individuals can produce? Group of answer choices A. heterozygous ones are more common B. all are produced in equal numbrers C. recessive ones are more common D. dominant ones are more commonarrow_forwardPlease read the scenario below and answer the question (in bold) that follows: An aquatic arthropod called a Cyclops has antennae that are either barbed (B) or smooth (b). In the same organism, non-resistance to pesticides (P) is dominant over resistance to pesticides (p). If a Cyclops that has smooth antennae and is resistant to pesticides is crossed with one that is heterozygous for both traits… 1. What percentage of their offspring will have smooth antennae and be resistant to pesticides? 2.What percentage of their offspring will have barbed antennae? Answer choice are 0%, 25%, 50%, 75%, 100%arrow_forward
- hybrid has two different genes for a given trait a. True b. Fasle If B indicates tallness then an organism with genes Bb will be short a. True b. False What is the result of meiosis l? a. two genetically identical cells b. four genetically different cells c. Two genetically different cells d. Four genetically identical cells In guinea pigs, black coat is dominant over white coat. To determine whether a black guinea pig is pure or hybrid black, it should be ideally phenotypically crossed with a; a. White guinea pig b. Black guinea pig c. Heterozygous guinea pig d. Homozygous dominant guinea pigarrow_forwardA woman has genotype Cc Dd; she inherited the C and D alleles from her father. The C and D loci are close together on the same chromosome; the recombination frequency between them is 20%. What is the probability that one of her eggs, randomly chosen, will have genotype C D? O a. 0.3 O b. 0.2 C. 0.6 O d. 0.4 е. O Oarrow_forwardIn fruit flies, long wings (L) are dominant over short wings (l). LL, Ll, and ll represent Select one: a. Three dominants b. Three phenotypes c. Three genotypes d. Three true breeding crossesarrow_forward
- A true breeding plant that produces elongated fruits is crossed to a true breeding plant that produces round fruits. The offspring of this cross all have oval-shaped fruit. Which of the following is true? A. This involves two genes, one that controls the length of the fruit and one that controls the width. B. This long allele is epistatic over the short allele. C. The long allele is dominant over the short allele. D. The long allele is incompletely dominant over the short allele.arrow_forwardIf an organism has two different alleles (call the alleles a andb) of a gene,a. its phenotype will be the same as an organism with twoidentical alleles of this gene.b. all of its gametes will contain both the a allele and theb allele.c. it is homozygous for that gene.d. it is heterozygous for that gene.arrow_forwardWhich of the following statements accurately represents the difference between a gene and a locus? a. A gene is dominant, and a locus is recessive. b. A locus and a gene are essentially the same - there is no difference. c. A locus occurs in diploid cells, and a gene occurs in a haploid cell. d. A locus is a phenotype and a gene is a genotype.arrow_forward
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