Gen Combo Ll Biology; Connect W/learnsmart Labs Access Card
4th Edition
ISBN: 9781259853197
Author: Robert Brooker
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 17, Problem 2TY
Based on the ideas proposed by Morgan, which of the following statements concerning linkage is false?
- a. Traits determined by genes located close together on the same chromosome are likely to be inherited together.
- b. Crossing over between homologous chromosomes can create new allele combinations.
- c. A crossover is more likely to occur in a region between two genes that are close together than in a region between two genes that are farther apart.
- d. The probability of crossing over depends on the distance between the genes.
- e. Genes that tend to be transmitted together are physically located on the same chromosome.
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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
Which of the following statements best describes the events associated with the recombination of genes?
a.
If two genes are located on the same chromosome, the alleles on non-sister chromatids of homologous chromosomes will segregate together if a crossover does not occur between the two genes.
b.
Any two genes located on the same chromosome are called linked genes.
c.
Crossovers are most likely to occur between linked genes that are close together.
d.
If the alleles in gametes after meiosis are different from those in the parents, the gametes are referred to as recombinant.
Which of the following is false, regarding the law of segregation?
A.
It states that each of two alleles for a given trait segregate into different gametes.
B.
It can be explained by the segregation of sister chromatids during mitosis.
C.
It can account for the 3:1 ratio seen in the F2 generation of Mendel's crosses.
D.
It can be used to predict the likelihood of transmission of certain genetic diseases within families.
Chapter 17 Solutions
Gen Combo Ll Biology; Connect W/learnsmart Labs Access Card
Ch. 17.1 - Prob. 1CCCh. 17.2 - Prob. 1EQCh. 17.2 - Prob. 2EQCh. 17.2 - Prob. 3EQCh. 17.2 - Prob. 1CCCh. 17.2 - Prob. 1BCCh. 17.2 - Prob. 2CCCh. 17.3 - Prob. 1BCCh. 17.3 - Prob. 1CCCh. 17.4 - Prob. 1CC
Ch. 17.4 - Prob. 2CCCh. 17 - Prob. 1TYCh. 17 - Based on the ideas proposed by Morgan, which of...Ch. 17 - Prob. 3TYCh. 17 - Extranuclear inheritance occurs because a. certain...Ch. 17 - Prob. 5TYCh. 17 - Modification of a gene during gamete formation or...Ch. 17 - Prob. 7TYCh. 17 - When a gene is inactivated during gamete formation...Ch. 17 - Prob. 9TYCh. 17 - Prob. 10TYCh. 17 - Prob. 1CQCh. 17 - Prob. 2CQCh. 17 - Prob. 3CQCh. 17 - Mendel studied seven traits in garden pea plants,...Ch. 17 - Prob. 2COQ
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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_forwardWhat gametes are produced by the following organisms: a. Genotype YyRr, if Y and R are on different chromosomes b. Genotype YyRr, if dominant Y and R are on the same chromosome, no crossing over c. Genotype YyRr, if dominant Y and recessive r are on the same chromosome, no crossing over d. Genotype YyRr, if dominant Y and R are on the same chromosome, 50% crossing over e. What is the genotype of the F1 generation if parents RRyy and rrYY are crossed, R and y are located on the same chromosome, no crossing over.arrow_forwardA cross between two pea plants with genotypes PpLI and PpLI results in an F1 generation that is 25% PPLL, 50% PpLI, and 25% ppll. Which reason most likely explains why other possible genotypes are not present? Choose 1 answer. A.The genes underwent independent assortment B.The loci of the genes are close together. C.The loci of the genes are on different chromosomes. D.Crossing over occurred between chromosomes.arrow_forward
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- How would one explain a testcross involving F1 dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced? Group of answer choices A. The testcross was improperly performed B. The two genes are linked C. Both of the characters are controlled by more than one gene D. The two genes are linked but on different chromosomes E. Recombination did not occur in the cell during meiosisarrow_forwardWhat is the difference between a monohybrid cross and a dihybrid cross? A. A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. B. A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny. C. A monohybrid cross involves organisms that are heterozygous for a single trait, whereas a dihybrid cross involves organisms that are heterozygous for two traits. D. A monohybrid cross is performed only once, whereas a dihybrid cross is performed twice.arrow_forwardWhich of the following is an explanation for independent assortment of alleles on different chromosomes (Mendel's second law)? A. Chromosomes can have different functions in various types of cells of the same organism. B. In metaphase I, alignment of 1 pair of replicated chromosomes does not affect the alignment of another pair. C. Each chromosome is capable of a different function. D. In prophase I, which chromosomes pairs with which other one is completely random. E. Chromosomes are divided into daughter cells in a random fashion.arrow_forward
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