EBK BIOLOGY
4th Edition
ISBN: 8220102797376
Author: BROOKER
Publisher: YUZU
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Chapter 17.2, Problem 1CC
Summary Introduction
To determine: The fly in which crossing over occurs to produce the recombinant offsprings in the F2 generation.
Introduction: During reproduction, the next generation inherits the parental traits. However, some new features are also seen in the offsprings. Linkage and crossing over are two phenomena that are responsible for the development of parental and recombinant types.
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A homozygous tomato plant with orange fruit and white flowers was crossed with a homozygous tomato plant with red fruit and red flowers. The F1 all had orange fruit and white flowers. The F1 were testcrossed by crossing them to homozygous recessive individuals and the following offspring were obtained:
Orange fruit and white flowers- 64
Red fruit and red flowers- 69
Orange fruit and red flowers- 14
Red fruit and white flowers- 13
What is the recombination frequency of these two genes?
If the genes are not assorting independently, what is the recombinationfrequency between them?
Wild-type mice have brown fur and short tails. Loss of function of a particular gene
produces white fur, while loss of function of another gene produces long tails, and loss
of function at a third locus produces agitated behavior. Each of these loss of function
alleles is recessive. If a wild-type mouse is crossed with a triple mutant, and their F1
progeny is test-crossed, the following recombination frequencies are observed among
their progeny. Produce a genetic map for these loci.
Brown, short tailed, normal: 955
White, short tailed, normal:
16
Brown, short tailed, agitated: 0
White, short tailed, agitated: 36
Brown, long tailed, normal:
White, long tailed, normal:
Brown, long tailed, agitated:
46
0
14
White, long tailed, agitated: 933
Chapter 17 Solutions
EBK BIOLOGY
Ch. 17.1 - Prob. 1CCCh. 17.2 - Prob. 1EQCh. 17.2 - Prob. 2EQCh. 17.2 - Prob. 3EQCh. 17.2 - Prob. 1CCCh. 17.2 - Prob. 1BCCh. 17.2 - Prob. 2CCCh. 17.3 - Prob. 1BCCh. 17.3 - Prob. 1CCCh. 17.4 - Prob. 1CC
Ch. 17.4 - Prob. 2CCCh. 17 - Prob. 1TYCh. 17 - Based on the ideas proposed by Morgan, which of...Ch. 17 - Prob. 3TYCh. 17 - Extranuclear inheritance occurs because a. certain...Ch. 17 - Prob. 5TYCh. 17 - Modification of a gene during gamete formation or...Ch. 17 - Prob. 7TYCh. 17 - When a gene is inactivated during gamete formation...Ch. 17 - Prob. 9TYCh. 17 - Prob. 10TYCh. 17 - Prob. 1CQCh. 17 - Prob. 2CQCh. 17 - Prob. 3CQCh. 17 - Mendel studied seven traits in garden pea plants,...Ch. 17 - Prob. 2COQ
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- In autotetraploid Chinese primrose (Primula sinensis L.), the gene controlling stigma color is very near the centromere of the chromosome carrying it. The allele G for green stigma is dominant to g for red stigmas. A homozygous green autotetraploid strain is crossed with a homozygous red autotetraploid strain. a. What is the genotype of the Fl1? b. Show the types of gametes the Fl's may be expected to form and derive the expected proportion of each. Show your solution. c. What phenotypic ratio of green to red is expected if: the Fl's are intercrossed? Show your solution. the Fl's are crossed with red plants? Show your solution. d. If the G locus were 50 or more map units from the centromere, what types and proportions of gametes would the Fl be expected to produce? Derive the expected F2 phenotypic ratio.arrow_forwardIn your own words, explain why a testcross cannot produce more than 50% recombinant offspring. When a testcross does produce 50% recombinant offspring, what does this result mean?arrow_forwardFrom the three-factor crosses of Figure 7.3, Morgan realized thatcrossing over was more frequent between the eye color and winglength genes than between the body color and eye color genes.Explain how he determined this.arrow_forward
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- Two linked loci have a recombination frequency of 5%. A series of crosses is performed. The P generation includes an individual that is homozygous dominant for trait 1 and homozygous recessive for trait 2. The second individual is homozygous recessive for trait 1 and homozygous dominant for trait 2. The F1 generation is crossed with individuals that are homozygous recessive for both traits. If 400 F2 offspring are produced, how many offspring with each phenotype are expected? Fill in the table below with your answers. Phenotype Number of Offspring Predicted Recessive 1, Recessive 2 Dominant 1, Dominant 2 Recessive 1, Dominant 2 Dominant 1, Recessive 2 Total offspring 400 For the results above, determine which phenotypes are parental and which are recombinant. Phenotype Parental or Recombinant? Dominant 1, Dominant 2 Recessive 1, Dominant 2 Recessive 1, Recessive 2 Dominant 1, Recessive 2arrow_forwardCalculate the recombination frequency between the Trf and the d loci by using the pooled data from all the crosses.arrow_forwardIn autotetraploid Chinese primrose (Primula sinensis L.), the gene controlling stigma color is very near the centromere of the chromosome carrying it. The allele G for green stigma is dominant to g for red stigmas. A homozygous green autotetraploid strain is crossed with a homozygous red autotetraploid strain. If the G locus were 50 or more map units from the centromere, what types and proportions of gametes would the Fl be expected to produce? Derive the expected F2 phenotypic ratio.arrow_forward
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