Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 16.6, Problem 1CC
Summary Introduction
To determine:
The fly or flies in which crossing over occurred to produce the recombinant offspring of the F2 generation.
Introduction:
Crossing over is defined as the exchange of genetic material of non-sister chromatid of the homologous chromosomes. This process occurs at the time of meiosis and will result in an increase in genetic diversity.
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When and in which fly or flies did crossing over occur in order to produce the F2 recombinant offspring?
Which two genotypes are from flies when a double crossover occurred?
How did the cessation of crossing-over contribute to the disparity between the X and Y chromosomes?
Chapter 16 Solutions
Principles of Biology
Ch. 16.1 - Which of the following is an epigenetic change...Ch. 16.2 - If you crossed an Igf 2 Igf 2- male mouse to an...Ch. 16.2 - Prob. 1TYKCh. 16.2 - Prob. 2TYKCh. 16.3 - Prob. 1CCCh. 16.3 - Prob. 1TYKCh. 16.3 - Which of the following statements regarding...Ch. 16.4 - Prob. 1TYKCh. 16.4 - Prob. 2TYKCh. 16.5 - Prob. 1BC
Ch. 16.5 - Prob. 1CCCh. 16.5 - Prob. 1TYKCh. 16.5 - Prob. 2TYKCh. 16.6 - Prob. 1CCCh. 16.6 - Prob. 1BCCh. 16.6 - Prob. 1TYKCh. 16.6 - Genes that are linked do not conform to Mendels...Ch. 16 - Which of the following is an example of an...Ch. 16 - In mice, the allele of the Igf2 gene that is...Ch. 16 - Prob. 3TYCh. 16 - The marking process for genomic imprinting...Ch. 16 - According to Mary Lyons hypothesis, the patchwork...Ch. 16 - Prob. 6TYCh. 16 - Prob. 7TYCh. 16 - Prob. 8TYCh. 16 - Prob. 9TYCh. 16 - Prob. 10TYCh. 16 - Prob. 1CCQCh. 16 - Prob. 2CCQCh. 16 - Prob. 3CCQCh. 16 - Prob. 1CBQCh. 16 - Prob. 2CBQ
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- When the tetrads are formed during meiosis, what is the benefit of crossing over?arrow_forwardIf two loci are 10 cM apart, what proportion of the cells in prophase of the first meiotic division will contain a single crossover in the region between them?arrow_forwardAn inversion heterozygote has the following inverted chromosome:What is the result if crossing over occurs between genes F and G onan inverted and a normal chromosome in this individual?Make a drawing. Predict the outcome.arrow_forward
- Does mitotic recombination occur in a gamete (sperm or egg cell) or in a somatic cell?arrow_forwardIn fruit flies, L= long wings and l = short wings. When a long-winged fly is crossed with a short winged fly, the offspring exhibit a 1:1 ratio. What is the genotype of the parental flies?arrow_forwardUnder what circumstance might two loci be on the same chromosome but behave as if independently assorting in crosses?arrow_forward
- In fruit flies, red eyes (pr+_) are dominant to purple eyes (prpr) and normal wings (vg+_) are dominant to vestigial wings (vgvg). The genes are located on the same chromosome. A pure-breeding red-eyed fly with vestigial wings was crossed with a pure-breeding purple-eyed fly with normal wings. All of the F1 progeny had a WT phenotype. The recombination frequency between the two genes is 15%. If an F1 individual were test crossed, what percentage of the progeny would you expect to have the WT phenotype?arrow_forwardAn inversion heterozygote has the following inverted chromosome:What would be the products if a crossover occurred between genesH and I on the inverted chromosome and a normal chromosome?arrow_forwardA cross was made between 2 Drosophila that have the wild phenotype. Their progenies were found to have the same phenotype. A sample was taken from 2000 progenies, each of which was crossed with a fly having purple eye color. Half of the cross gave only wild type flies and the other half gave 50% purple-eyed progeny. What were the genotypes of the original pairs of wild type flies?arrow_forward
- Could you have generated a chromosome map from the F2 progeny in cross 1 (assuming you crossed F1 males and females to each other to generate the F2)? What is the advantage of using cross 2 instead?arrow_forward+ ec +/Y + + w/Y y ec +/Y + ec +/y ec w ++ w/y ec w у ес +у ес и Determine the order in which the three loci y, ec, and w Occur on the chromosome and prepare a linkage map. 7.22 A cross involving X-linked genes was made between yellow, bar, vermilion female fies and wild males, and the F1 females were crossed with y B v males. The following phenotypes were obtained when 1000 progeny were exam- ined: Dra ord ma the 7.2 546 244 160 50 + + + + Bv y Bv y+ + y+v y B+ and an and and and +B + re + + v ge Determine the order in which the three loci occur on the chromosome and prepare a linkage map. 7.23 Female Drosophila heterozygous for ebony (e"le), scarlet (st*/st), and spineless (ss*/ss) were testcrossed, and the following progeny were obtained: PROGENCY PHENOTYPES NUMBER ir Wild type Ebony Ebony, scarlet Ebony, spineless Ebony, scarlet, spineless Scarlet 67 8. 68 347 78 368 Scarlet, spineless Spineless (a) Are these genes linked? Justify your answer. (b) Write the genes given on a…arrow_forwardGiven the karyotype shown at right, is this a male or a female? Normal or abnormal? What would the phenotype of this individual be?arrow_forward
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