BIOLOGY 2E
2nd Edition
ISBN: 9781506699851
Author: OpenStax
Publisher: XANEDU PUBLISHING
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Textbook Question
Chapter 12, Problem 29CTQ
Why is it more efficient to perform a test cross with a homozygous recessive donor than a homozygous dominant donor? How could the same information still he found with a homozygous dominant donor?
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in 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?
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.)
For linkage analysis, a test cross is used rather than a hybrid cross. Why is this essential? Why would a hybrid cross result in incorrect estimates of genetic distance?
Chapter 12 Solutions
BIOLOGY 2E
Ch. 12 - Figure 12.5 In pea plants, round peas (R) are...Ch. 12 - Figure 12.6 What are the genotypes of the...Ch. 12 - Figure 12.12 What ratio of offspring would result...Ch. 12 - Figure 12.16 In pea plants, purple flowers (P) are...Ch. 12 - Mendel performed hybridizations by transferring...Ch. 12 - Which is one of the seven characteristics that...Ch. 12 - Imagine you are performing a cross involving seed...Ch. 12 - Consider a cross to investigate the pea pod...Ch. 12 - A scientist pollinates a true-breeding pea plant...Ch. 12 - The observable traits expressed by an organism are...
Ch. 12 - A recessive trait will be observed in individuals...Ch. 12 - If black and white true-breeding mice are mated...Ch. 12 - The ABO blood groups in humans are expressed as...Ch. 12 - In a mating between two individuals that are...Ch. 12 - If the allele encoding polydactyly (six fingers)...Ch. 12 - A farmer raises black and white chickens. To his...Ch. 12 - Assuming no gene linkage, in a dihybrid cross of...Ch. 12 - The forked line and probability methods make use...Ch. 12 - How many different offspring genotypes are...Ch. 12 - Labrador retriever's fur color is controlled by...Ch. 12 - Which of the following situations does not follow...Ch. 12 - Describe one of the reasons why the garden pea was...Ch. 12 - How would you perform a reciprocal cross for the...Ch. 12 - Mendel performs a cross using a true-breeding pea...Ch. 12 - Calculate the probability of selecting a heart or...Ch. 12 - The gene for flower position in pea plants exists...Ch. 12 - Use a Punnett square to predict the offspring in a...Ch. 12 - Can a human male be a carrier of red-green color...Ch. 12 - Why is it more efficient to perform a test cross...Ch. 12 - Use the probability method to calculate the...Ch. 12 - Explain epistatis in terms of its Greek-language...Ch. 12 - In Section 12.3, ''Laws of Inheritance," an...Ch. 12 - People with trisomy 21 develop Down’s syndrome....Ch. 12 - A heterozygous pea plant produces violet flowers...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Given the karyotype shown at right, is this a male or a female? Normal or abnormal? What would the phenotype of this individual be?arrow_forwardIndividuals of genotype AaBb were mated to individuals of genotype aabb. One thousand offspring were counted, with the following results: 474 Aabb, 480 aaBb, 20 AaBb, and 26 aabb. What type of cross is it? Are these loci linked? What are the two parental classes and the two recombinant classes of offspring? What is the percentage of recombination between these two loci? How many map units apart are they?arrow_forwardDoes a molecular marker have to be polymorphic to be useful in physical mapping studies? Does a molecular marker have to be polymorphic to be useful in linkage mapping (i.e., involving family pedigree studies or genetic crosses)? Explain why or why not.arrow_forward
- What is the diagnostic test for linkage?arrow_forwardCalculate the recombination frequency between the Trf and the d loci by using the pooled data from all the crosses.arrow_forwardIn one of Mendel’s dihybrid crosses, he observed315 round, yellow; 108 round, green; 101 wrinkled,yellow; and 32 wrinkled, green F2 plants. Analyze thesedata using the x2 test to see if(a) they fit a 9:3:3:1 ratio.(b) the round:wrinkled data fit a 3:1 ratio.(c) the yellow:green data fit a 3:1 ratio.arrow_forward
- An individual heterozygous for a reciprocal translocation possesses the following chromosomes: A B • C D E F G A B • C D V W X R S • T U E F G R S • T U V W X Q. Give the products that result from alternate, adjacent-1, and adjacent-2 segregation.arrow_forwardYou 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.)arrow_forwardA three point testcross is carried out between three linked genes. The resulting nonrecombinant progeny are d+b+k+ and dbk and the double-crossover progeny are dbk+ and d+b+k. Which is the middle locus? Show all your work. Show all possible progeny.arrow_forward
- What is the probability of producing a child that will phenotypically resemble either one (one OR the other) of the two parents in the following crosses? a) Aa bb cc dd X AA BB CC DD b) Aa Bb Cc Dd X Aa Bb Cc Dd c) Aa bb cc dd X aa bb cc dd Make sure to show your work in details.arrow_forwardA series of crosses were performed between pure breeding lines of mice with different coat colours. a) Based on the results of the crosses, describe the type of gene interaction that gives the white phenotype. Explain your reasoning. b) Determine the order of the function.arrow_forwardA student crossed a female worm homozygous for the dpy-17 e164 allele with a wild-type male worm heterozygous for dpy-17 e164. He then scored all of the developing eggs/larva for the Dpy phenotype. He found 88 with the Dpy phenotype and 98 wild type. Do a Chi square test on phenotypic data to determine if your data supports the hypothesis that the mutation segregates as a single-gene mutation. Show your work in a table and include Null hypothesis Χ2 value dof p value Conclusionarrow_forward
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