BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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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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- Given 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_forwardStep 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_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_forwardWhich 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.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_forwardMorgan observed a higher number of recombinant offspring involvingeye color and wing length (401 + 318) than recombinants forbody color and eye color (17 + 12). These results occurred because a. the genes affecting eye color and wing length are fartherapart on the X chromosome than are the genes affectingbody color and eye color.b. the genes affecting eye color and wing length are closer togetheron the X chromosome than are the genes affectingbody color and eye color.c. the gene affecting wing length is not on the X chromosome.d. the gene affecting body color is not on the X chromosome.arrow_forwardExamination 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_forward
- For 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_forwardCreate a chromosome map for each set of three genes from the given information. b) the crossover frequency between gene X and gene Z is 8.5 %, the crossover frequency between gene Y and gene Z is 2.25 % and between gene Y and gene X is 6.25 %arrow_forwarda. Which progeny are the parental types? How can you tell?b. Which progeny are the recombinants? How can you tell?c. Do the results of this test cross support linkage of the traits? What is the % recombination?arrow_forward
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