BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Textbook Question
Chapter 13.4, Problem 2LO
Explain the relationship between frequency of recombinant progeny and map distance.
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Define the term recombination frequency?
Explain the following pairs of concepts and briefly describe their major difference(s)
1. Recombination fraction & genetic distance.
EC1. In drosophila the cw (curly wings) gene and eb (ebony body) genes are found on the same chromosome 20 map units apart. A cross was made between an ebony bodied parental strain and a curly winged parental strain and the F1’s were test crossed.
a) What are the genotypes of the parental strains?
b) What are the genotypes of the F1’s?
c) What is the genotype of the tester strain?
d) What progeny phenotypes and genotypes do you expect, and in what proportions? For phenotypes use the mutant phenotype for any that the flies have, and wild-type if they have none.
EC2. Here is a tetrad produced by mating a H Y strain to an h y strain.
a) What is the tetrad type?
b) What has recombined with what?
EC3. In corn, a dihybrid for the recessive genes a and b is test-crossed. The distribution of the phenotypes is as follows:
A B 122A b 118a B 81a b 79
a) Do the genes appear to be sorting independently? Look at map units here.
b) Test your hypothesis with a chi-squared test.
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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- a. Determine the gene order, the recombination frequency between the adjacent genes, the coefficient of coincidence, and the interference. b. Explain why, in this example, the recombination frequencies are not good estimates of the map distance.arrow_forwardHow linkage and crossing over is inter-related explain in detail giving suitable examples?arrow_forwardDefine duplicationsarrow_forward
- Consider a maize plant: Genotype C/cm ; Ac/Ac+ where cm is an unstable colorless allele caused by Ds insertion. What phenotypic ratios would be produced and in what proportions when this plant is crossed with a mutant c/c Ac+/Ac+? Assume that the Ac and c loci are unlinked, that the chromosome-breakage frequency is negligible, and the C allele encodes pigment production.arrow_forwardDescribe the key steps for homologous recombination.arrow_forwardExplain two ways that a chromosomal rearrangement can cause a position effect.arrow_forward
- Construct a map of the chromosome from the following recombination frequencies between individual pairs of genes: c – f 8%, v – f 12%, s – v 16%, v – c 4%, s – f 6%arrow_forwardExplain what linkage is, why linked genes do not assort independently, and state what must happen for recombination to occurarrow_forwardExplain A Model of Recombination at the Molecular Level?arrow_forward
- In genetic recombination bycrossing over what is thedifference between parentalgametes and recombinantgametes?arrow_forwardDescribe the principle of a banding technique that can be used to helpvisualise chromosomes and chromosome regions during karyotyping.arrow_forwardExplain why inversions and reciprocal translocations do not usually cause a phenotypic effect. In a few cases, however, they do. Explain how.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