Biology
12th Edition
ISBN: 9781260494570
Author: Raven, Peter
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 13, Problem 4U
The map distance between two genes is determined by the
a. recombination frequency.
b. frequency of parental types.
c. ratio of genes to length of a chromosome.
d. ratio of parental to recombinant progeny.
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Students have asked these similar questions
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
When recombination (“crossing over”) doesn’t happen correctly, what type(s) of mutations that can occur?
circle all that apply
Select one or more:
a. Inversion (reversal or “flipping” of part of a chromosome)
b. Duplication of part of a chromosome
c. Translocation (transfer of part of a chromosome to a non-homologous chromosome)
d. Deletion of part of a chromosome
In the diagram in the box below the horizontal line represents a chromosome and A,
B, C, D and E represent the position of genes on the chromosome.
You would expect the highest frequency of recombination of genes to occur
between?
A
BC
D
E
Lll
S
a) Between genes B and D
b) Between genes B and C
c) Between genes A and B
d) Between genes A and C
Chapter 13 Solutions
Biology
Ch. 13.1 - Describe sex-linked inheritance in fruit flies.Ch. 13.1 - Prob. 2LOCh. 13.2 - Prob. 1LOCh. 13.2 - Explain the genetic consequences of dosage...Ch. 13.3 - Prob. 1LOCh. 13.4 - Prob. 1LOCh. 13.4 - Explain the relationship between frequency of...Ch. 13.4 - Prob. 3LOCh. 13.5 - Prob. 1LOCh. 13.5 - Prob. 2LO
Ch. 13.5 - Prob. 3LOCh. 13 - Inquiry question Mendel did not examine plant...Ch. 13 - What would Mendel have observed in a dihybrid...Ch. 13 - Prob. 2DACh. 13 - Why is the white-eye phenotype always observed in...Ch. 13 - In an organisms genome, autosomes are a. the...Ch. 13 - What cellular process is responsible for genetic...Ch. 13 - The map distance between two genes is determined...Ch. 13 - How many map units separate two alleles if the...Ch. 13 - How does maternal inheritance of mitochondrial...Ch. 13 - Which of the following genotypes due to...Ch. 13 - Prob. 1ACh. 13 - As real genetic distance increases, the distance...Ch. 13 - Down syndrome is the result of trisomy for...Ch. 13 - Genes that are on the same chromosome can show...Ch. 13 - The A and B genes are 10 cM apart on a chromosome....Ch. 13 - Prob. 6ACh. 13 - Color blindness is caused by a sex-linked,...Ch. 13 - Assume that the genes for seed color and seed...Ch. 13 - A low frequency of calico cats are male (about...
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- Step 3: Compare the Parentals with the Double Cross Overs (DCO) to determine the correct order of the genes along the chromosome. A. List the alleles on the chromosome diagrams below. Parentals DCO B. Which single gene allele pair in the double cross over if exchanged would make the double cross over chromosomes be exactly like the Parentals? C. Reorder the alleles on the Parental chromosomes so that the gene allele pair in part B is in the middle. Check the order, by creating a double cross over of the Parental chromosomes. If alleles combination (not order) matches the DCO then you correctly determined which gene is in the middle for the chromosome map. Parentals Step 4: Rewrite all the gene orders in Step 2 in the space below with the correct gene in the middle.arrow_forwardGiven the following frequency, what is the sequence of the chromosome map? A-G: 18%; R-G: 3%; A-K: 3%; and A-R:7% A. AKRG B. ARGK C. GRKA D. RKGAarrow_forwardYou breed two monster parents (green, hairless) GGhh and ggHH (white, hairy) to produce F1 offspring (green, hairy). Genes G and H are on the same chromosome. a. What are the dominant phenotypes? b. What are ALL of the potential gamete genotypes that could be created by an F1? Clearly indicate the recombinant genotypes. c. Explain how recombinants are created. d. What are the potential offspring genotypes from the cross of a F1 monster with a homozygous recessive monster. e. From this test cross you get 152 green, hairless; 23 green, hairy; 148 white, hairy, and 27 white, hairless. Calculate the chi squared to test the independent assortment hypothesis and determine if these genes assort independently.arrow_forward
- 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_forwardWhen recombination (“crossing over”) doesn’t happen correctly, what type(s) of mutations that can occur? Mark all that apply Select one or more: a. Deletion of part of a chromosome b. Translocation (transfer of part of a chromosome to a non-homologous chromosome) c. Duplication of part of a chromosome d.Inversion (reversal or “flipping” of part of a chromosome)arrow_forwardGiven the following frequency, what is the sequence of the chromosome map? D-A: 6%; D-E: 12%; V-E: 2%; and D-V:8% A. EVAD B. DVAE C. DAVE D. VDEAarrow_forward
- Create a chromosome map each set of three genes from the given information. a) The crossover frequency between gene A and gene B is 23%, the crossover frequency between gene B and gene C is 11%, and between gene A and C is 12%arrow_forwardFor single crossovers, the frequency of recombinant gametes is half the frequency of crossing over because a. a testcross between a homozygote and a heterozygote produces ½ heterozygous and ½ homozygous progeny.b. the frequency of recombination is always 50%.c. each crossover takes place between only two of the four chromatids of a homologous pair.d. crossovers take place in about 50% of meioses.arrow_forwardChromosome translocations include: A. Alterations in which the genetic material remains the same but rearranged B. Alterations in which the total amount of genetics information increases C. Alterations in which the total amount of genetics information decreases D. Variations in the chromosome numberarrow_forward
- Examination of a karyotype reveals 23 pairs of chromosomes, with each homologous pair illustrating similar size and centromere location. Which of the following can be concluded from this karyotype?a. The individual has Down syndrome.b. The individual is a female.c. The individual does not have cystic fibrosis.d. The individual does not have sickle-cell anemia.arrow_forwardWhich of the following best describes the concept of independent assortment? Group of answer choices a. 2n, where n = number of chromosomes b. Gametes receive one of each chromosome pair but which chromosome it receives is decided randomly c. Refers to the Mendelian genetics d. Independent assortment always occurs at prophase 2 in eukaryotic organisms. e. Is the process of specified segregation and assortment of chromosomes in an organism.arrow_forwardAltered chromosome structure can drastically affect an individual organism’s phenotype. However, some types of chromosomal rearrangements are more likely to be harmful than others. Categorize the following types of rearrangements from MOST LIKELY to be harmful to LEAST LIKELY to be harmful. A. reciprocal translocation, deletion, translocation B. deletion, translocation, inversion C. inversion, translocation, reciprocal translocation D. translocation, inversion, duplicationarrow_forward
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