BIOLOGY
12th Edition
ISBN: 9781260169614
Author: Raven
Publisher: RENT MCG
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Chapter 12, Problem 3S
Summary Introduction
To explain:
The outcome of the cross of yellow mice and to test the hypothesis.
Introduction:
Lethal genes or alleles are the genes that can cause death of an organism if present in the homozygous condition (i.e., both alleles of the individual are identical lethal alleles). In the given case, when yellow mice were crossed, there were two yellow mice and only one black mouse.
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You perform a cross between a parent with the genotype WWiiNNttEErr and another parent that is
wwllnnTTeerr. All genes are unlinked except for W and I which are 22 mu apart.
You take an F1 from this cross and cross it with an individual that is wwiiNntteerr.
a) What is the probability that this final cross yields an offspring that is wwiinntteerr?
b) What is the probability that this final cross yields an offspring that is NNTT or Nntt. (You can
ignore all of the other genes for this question.)
You perform a cross between a parent with the genotype WWiiNNttEErr and another parent that is
wlnnTTeerr. All genes are unlinked except for W and I which are 22 mu apart.
You take an F1 from this cross and cross it with an individual that is wwiiNntteerr.
a) What is the probability that this final cross yields an offspring that is wwiinntteerr?
b) What is the probability that this final cross yields an offspring that is NNT or Nntt. (You can
ignore all of the other genes for this question.)
In this test cross of AaBbCc you got these results:
100 АВС
100 abc
100 ABC
100 abC
25Abc
25ABC
25 аBС
25 аВс
a)
Which two genes are linked? Show or explain how you know.
b)
How far apart are those genes?
Chapter 12 Solutions
BIOLOGY
Ch. 12.1 - Prob. 1LOCh. 12.1 - Explain the advantages of Mendels experimental...Ch. 12.2 - Evaluate the outcome of a monohybrid cross.Ch. 12.2 - Explain Mendels Principle of Segregation.Ch. 12.2 - Compare the segregation of alleles with the...Ch. 12.3 - Evaluate the outcome of a dihybrid cross.Ch. 12.3 - Explain Mendels Principle of Independent...Ch. 12.3 - Compare the segregation of alleles for different...Ch. 12.4 - Prob. 1LOCh. 12.4 - Prob. 2LO
Ch. 12.5 - Interpret data from testcrosses to infer unknown...Ch. 12.6 - Describe how assumptions in Mendels model result...Ch. 12.6 - Prob. 2LOCh. 12.6 - Explain the genetic basis for observed alterations...Ch. 12 - Inquiry question What confounding problems could...Ch. 12 - Prob. 2IQCh. 12 - Prob. 1DACh. 12 - Prob. 2DACh. 12 - Prob. 3DACh. 12 - What property distinguished Mendels investigation...Ch. 12 - The F1 generation of the monohybrid cross purple...Ch. 12 - The F1 plants from the previous question are...Ch. 12 - In a cross of Aa Bb cc X Aa Bb Cc, what is the...Ch. 12 - An organisms __________ is/are determined by its...Ch. 12 - Phenotypes like height in humans, which show a...Ch. 12 - Japanese four oclocks that are red and tall are...Ch. 12 - If the two genes in the previous question showed...Ch. 12 - What is the probability of obtaining an individual...Ch. 12 - Prob. 4ACh. 12 - Prob. 5ACh. 12 - Mendels model assumes that each trait is...Ch. 12 - z1. Create a Punnett square for the following...Ch. 12 - Explain how the events of meiosis can explain both...Ch. 12 - Prob. 3SCh. 12 - In mammals, a variety of genes affect coat color....
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- How can the product rule be used to predict the results of crosses in which multiple genes are studied simultaneously?arrow_forwardPure-breeding parental strains of corn with the purple, smooth and yellow, wrinkled phenotypes were crossed to produce an F1 generation, which were then crossed to produce the F2 generation. Complete the diagram showing the results of the cross below. (I included an enlarged picture of the corn as well)arrow_forwardA Neurospora colony at the edge of a plate seemed to be sparse (low density) in comparison with the other colonies on the plate. This colony was thought to be a possible mutant, and so it was removed and crossed with a wild type of the opposite mating type. From this cross, 100 ascospore progeny were obtained. None of the colonies from these ascospores was sparse, all appearing to be normal. What is the simplest explanation of this result? How would you test your explanation? (Note: Neurospora is haploid.)arrow_forward
- You have a garden and some pea plants have dark leaves and others have striped leaves. You conduct a series of crosses (1 through 5) and obtain the results given in the table. What is the genotype of the parents in cross 1? A) Aa x aaB) Aa x AaC) aa x aaD) AA x aaarrow_forwardWhen crossing a true breeding white mouse with a true breeding brown mouse your friend tells you she recovered all black mice. But then when she crosses the F1 mice to each other she recovered 28 black mice, 8 brown mice, and 13 white mice. Can you help her explain these results? (Type out the cross and include genotypes of as many mice as possible. What phrase best describes this phenomenon? How many genes are involved are they linked or unlinked? Etc.)arrow_forwardin three points mapping one parent has the A+C/+b+ genotype that was crossed to a homozygous recessive second parent. a)what is the genotype of this second parent? b)what are the genotypes of the double cross over offspring?arrow_forward
- Nicotiana glutinosa (2 n = 24) and N. tabacum (2 n = 48) are two closely related plants that can be intercrossed, but the F1 hybrid plants that result are usually sterile. In 1925, Roy Clausen and Thomas Goodspeed crossed N. glutinosa and N. tabacum and obtained one fertile F1 plant . They were able to self-pollinate the flowers of this plant to produce an F2 generation. Surprisingly, the F2 plants were fully fertile and produced viable seeds. When Clausen and Goodspeed examined the chromosomes of the F2 plants, they observed 36 pairs of chromosomes in metaphase I and 36 individual chromosomes in metaphase II. Explain the origin of the F2 plants obtained by Clausen and Goodspeed and the numbers of chromosomes observed.arrow_forwardThe genotypes of F1 individuals in a trihybrid cross are LlMMNn x llMmNn. What is the probability that the F2 offspring will have an LlMmnn genotype? Use the forked-line method in solving the problem.arrow_forwardWhy are some crosses not performed in a complementation matrix?arrow_forward
- The 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_forwardIn 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!arrow_forwardWhat are monohybrid crosses? Is it possible to make a cross in which only one single character is actually involved, or is it just that one single character is being analyzed and the others are being ignored?arrow_forward
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