BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 13, Problem 2A
As real genetic distance increases, the distance calculated by recombination frequency becomes an
a. overestimate due to multiple crossovers that cannot be scored.
b. underestimate due to multiple crossovers that cannot be scored.
c. underestimate due to multiple crossovers adding to recombination frequency.
d. overestimate due to multiple crossovers adding to recombination frequency.
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a. 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?
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.
In letter B: If the map distance equals the number of recombinant/total of offspring, wouldn't it be 24/806 x 100? Wouldn't we add both recombinants?
Can you explain letter C? I don't grasp that concept well.
And since I'm using my question already, would you be able to answer D.
Thank you!
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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- What is/are the phenotypes of the recombinant offspring of the F2generation?a. red eyes, long wingsb. white eyes, miniature wingsc. red eyes, long wings and white eyes, miniature wingsd. red eyes, miniature wings and white eyes, long wings [Answer the multiple-choice questions based on the following experiment:P generation: True-breeding flies with red eyes and long wings werecrossed to flies with white eyes and miniature wings. All F1 offspringhad red eyes and long wings.The F1 female flies were then crossed to males with white eyes and miniaturewings. The following results were obtained for the F2 generation:129 red eyes, long wings133 white eyes, miniature wings71 red eyes, miniature wings67 white eyes, long wings]arrow_forwardThe table below shows the progeny of a test cross of a heterozygote (HhFfGg). Each row shows the number of progeny that inherited each combination of alleles from the heterozygous parent. You've already determined the gene order (G is in the middle) and labeled each type of progeny. Using this information, what is the recombination frequency between H and G? Alleles: Type: HGF hgf HgF h Gf Hgf h GF HGf hg F O 0.543 0.302 O 0.241 O 0.23 0.139 Parental Parental DCO DCO SCO (H-G) SCO (H-G) SCO (G-F) SCO (G-F) Count: 124 119 15 18 51 55 38 40 O The correct answer is not available.arrow_forwardThe following recombination frequencies are calculated for four linked genes in the image attached: What is the frequency of crossing-over between A and D? a. 8% b. 6% c. 15% d. 11%arrow_forward
- You cross two plants and get the following results: Recombinant progeny type A: 43 Recombinant progeny type B: 51 Nonrecombinant progeny type C: 129 Nonrecombinant progeny type D: 135 What is the recombination frequency? (Enter your answer as a % without the sign. For example, if your answer is 0.534, you would enter 53.4)arrow_forwardKnown deletions (1–6) were crossed to each other. The following chart shows which crosses produced wild-type offspring (+) and which crosses produced no wild-type offspring (−). Point mutants (a–f) were then crossed to these deletions. The results of these crosses are shown in the second chart. Which two deletions have the greatest distance between them? a. 3, 6 b. 2, 6 c. 2, 3 d. 4, 5 e. 1, 5arrow_forwardWhen you test cross DdSsNn, you obtain the following numbers of offspring with the following phenotypes out of a total of 1449 offspring: DSN 427 dsn 447 dSN 218 Dsn 210 DSn 68 dsN 71 dSn 6 DsN 2 A. Calculate the distances between D and S. Show your work. B. Calculate the distances between S and N. Show your work. C. How many double crossovers would you expect if there were no interference? Show your work. D. Calculate the coefficient of coincidence and interference based upon your answer in part C. Show your work.arrow_forward
- Calculate the recombination frequency from the following data collected from a breeding experiment with butterflies. Parent 1: dihybrid, long legs and blue wings. Parent 2: double recessive, short legs and white wings Offspring: 50 long legs and white wings 200 long legs and blue wings 50 short legs and blue wings 200 short legs and white wings Recombination frequency is: Select one: a. 0.25 (25%) b. 0.10 (10%) c. 0.20 (20%) d. 0.33 (33%) e. 0.50 (50%)arrow_forwardA crossover has occurred in the bivalent shown figure.If a second crossover occurs in the same region between these twogenes, which two chromatids would be involved to produce thefollowing outcomes?A. 100% recombinantsB. 0% recombinantsC. 50% recombinantsarrow_forwardI am studying a pair of genes, A and B, that I think are both located on the same chromosome. After counting offspring from a test cross of an AaBb individual, I notice that recombination frequency for genes A and B is very low (~4%). From this, I can conclude that Select one: a. A and B are sex-linked b. A and B are actually on different chromosomes c. A and B are very close together on the same chromosome d. A and B on the same chromosome, but far apartarrow_forward
- Explain the following pairs of concepts and briefly describe their major difference(s) 1. Recombination fraction & genetic distance.arrow_forwardUse the data provided in the figure to calculate the recombination frequency between the two genes. Parents Wild Type (gray with normal wings) bb vg* vg Black with vestigial wings bb vg vg recombination frequency: % + TOOLS x10 Wild Type Black nogmal Black vestigial Gray vestigial b'bvg vg bb vg vg bb vg vg bb vg vg The number of each type of offspring is • wild type: 865 • black vestigial: 875 • gray vestigial: 160 • black normal: 100arrow_forwardWhich of the following statements best describes the events associated with the recombination of genes? Select one: a. Crossovers are most likely to occur between linked genes that are close together. b. If the alleles in gametes after meiosis are different from those in the parents, the gametes are referred to as recombinant. c. Any two genes located on the same chromosome are called linked genes. d. 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.arrow_forward
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genetic recombination strategies of bacteria CONJUGATION, TRANSDUCTION AND TRANSFORMATION; Author: Scientist Cindy;https://www.youtube.com/watch?v=_Va8FZJEl9A;License: Standard youtube license