You are trying to establish true breeding colonies of snails that are Dextral and Sinistral, and you have one female whose genotype you do not know. If you observe Sinistral phenotypes in the F1 offspring: please answer both questions A and B. A. Can you determine her genotype (and what is it if so)? B. Can you determine her phenotype (and what is it if so)?|

You are trying to establish true breeding colonies of snails that are Dextral and Sinistral, and you have one female whose genotype you do not know. If you observe Sinistral phenotypes in the F1 offspring: please answer both questions A and B. A. Can you determine her genotype (and what is it if so)? B. Can you determine her phenotype (and what is it if so)?|

Name: You are trying to establish true breeding colonies of snails that are
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Description: You are trying to establish true breeding colonies of snails that are Dextral and Sinistral, and youhave one female whose genotype you do not know. If you observe Sinistral phenotypes in theF1 offspring: please answer both questions A and B.A. Can y

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 5RQ: Imagine that you are performing a cross involving seed texture in garden pea plants. You cross...

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Based on the information you discovered in the previous problem, answer the following:a. A female fruit fly with genotype Tt nn is mated toa male of genotype Tt Nn. What is the probabilitythat any one of their offspring will have normalphenotypes for both characters?b. What phenotypes would you expect among the offspring of this cross? If you obtained 200 progeny, howmany of each phenotypic class would you expect?
Imagine that you are performing a cross involving seed texture in garden pea plants. You cross true-breeding round and wrinkled parents to obtain F1 offspring. Which of the following experimental results in terms of numbers of plants are closest to what you expect in the F2 progeny? a. 8lOroundseeds b. 8lOwrinkledseeds c. 405:395 round seeds:wrinkled seeds d. 610:190 round seeds:wrinkled seeds
In a species of fish, the allele for long fins (F) is dominant over the allele for short fins (f). What will be the genotype and phenotype ratios for offspring do we get if we cross a long-finned homozygous male fish with heterozygous long-finned female fish? Questions: a. What are the possible genotypes of the egg the woman can produce? b. What are the possible genotypes of the sperm the man can produce? c. What is the genotype ratio for the offspring? d. What is the phenotype ratio for the offspring?
If you cross a fruit fly with the genotype Gg, Hh, II, Jj to another fruit fly with genotype Gg, Hh, Ii, jjwhat fraction of their offspring do you expect to have genotype Gg, HH, II, jj? Show your work using individual punnett square for each trait then multiplying the fractions found through the punnett squares
Two genes control color in corn snakes as follows:O– B– snakes are brown, O– bb are orange, oo B– areblack, and oo bb are albino. An orange snake wasmated to a black snake, and a large number of F1progeny were obtained, all of which were brown.When the F1 snakes were mated to one another, theyproduced 100 brown offspring, 25 orange, 22 black,and 13 albino.a. What are the genotypes of the F1 snakes?b. What proportions of the different colors wouldhave been expected among the F2 snakes if the twoloci assort independently?
What conclusion can you draw from Figure 24.18 about the proportionof phenotypic variation in shell breadth that is due to geneticdifferences? Explain your reasoning.
Imagine you have two pure-breeding lines of canaries,one with yellow feathers and the other with brownfeathers. In crosses between these two strains, yellowfemale × brown male gives only brown sons anddaughters, while brown female × yellow male givesonly brown sons and yellow daughters. Propose ahypothesis to explain these results
A mouse from a true-breeding population with normal gait was crossed to a mouse displaying an oddgait called dancing. The F1 animals all showednormal gait.a. If dancing is caused by homozygosity for the recessive allele of a single gene, what proportion ofthe F2 mice should be dancers?b. If mice must be homozygous for recessive allelesof each of two different genes to have the dancing phenotype, what proportion of the F2 shouldbe dancers if the two genes are unlinked?(Assume that all the mice in the populationwith normal gait were homozygous fordominant alleles.)c. When the F2 mice were obtained, 42 normal and8 dancers were seen. Use the chi-square test todetermine if these results better fit the one-genemodel from part (a) or the two-gene model frompart (b).
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Doesn't the The F1 offspring being all LlDd means that the F1 centipedes have long legs and DARK colored bodies. Since D (dark) is dominant to to d (light)? Then if you drew a punnett swuare, wouldn't all the offspring being LlDd mean that none of the offspring have light bodies and short legs? So I don't understand the 25/4 fraction that you got for part a and where did the 1/16 come from?
In garden peas, the gene for red flowers (R) is dominant over the gene for white flowers (r). If pollen (cells containing sperm nuclei) from the anther (male reproductive organ) of a homozygous red-flowered plant is added to the pistil (female reproductive organ containing the egg) of a white-flowered plant: a. What would be the expected phenotypic and genotypic ratios in the first generation of offspring? b. If two members of the first generation of offspring were crossed, what would be the expected phenotypic and genotypic ratios in the next generation?