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Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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
Transcribed Image Text:You are given a pea that produces round, yellow seeds (both dominant traits), but its genotype is
unknown. You conduct a testcross to determine the genotype at both loci, and find that the offspring
have the following ratios of phenotypes:
% round, yellow, % round, green, ¼ wrinkled, yellow, % wrinkled, green
1. What are all the possible genotypes of a round, yellow pea? Assume shape is controlled by the R
locus, and color is controlled by the Y locus.
2. Break this down to the single gene level by answering the following questions:
a. What is the proportion of round to wrinkled offspring?
b. What is the proportion of yellow to green offspring?
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- a) how many degree of freedom b) what is the chi square value c) what is the percentage assurance d) is your data a good fit for the ration you expected. Previous question asks in pea plants stem length is either long dominant or short recessive. 2 heterozygous long pea plants were crossed. The progeny included 402 pea plants, 308 of which were long and 94 of which were short. The ratio is 3:1arrow_forwardThe following results were obtained from a dihybrid cross between two pea plants: 315 plants with round seeds and yellow flowers 101 plants with wrinkled seeds and yellow flowers 108 plants with round seeds and white flowers 32 plants with wrinkled seeds and white flowers Assume that round seeds and yellow flowers are dominant and both parent plants were heterozygous for both traits.arrow_forwardRound (R) and yellow (Y) are dominant over wrinkled (r) and green (y) peas. Given the case that parent plant 1 is homozygous for the round pea trait and heterozygous for the yellow trait, and parent plant 2 is heterozygous for the round trait and is green, answer the following questions 1. The genotype for parent plant 1 is and the genotype for parent plant 2 is 2. The percentage of offspring with green peas is 3. The percentage of offspring with wrinkled peas is % 4. The offspring would most likely show the phenotypes of shaped peas and coloured peas.arrow_forward
- In the red spotted butterfly there are two traits under investigation. The wing margin can be either notched (N) or straight (n) and the wing color can be either pale yellow (b) or bright yellow (B). A bright yellow male with straight wing margins was crossed with a bright yellow female with notched wing margins. All of the resulting progeny had notched wings and both color patterns were present. From these data determine the genotypes of the butterflies used in the original cross.arrow_forwardFine spines (s), smooth fruit (tu), and uniform fruit color (u) are three recessive traits in cucumbers. A cucumber plant heterozygous for all three traits is used in a test cross, and the following progeny are produced from this test cross. Type Number SU TU su Tu Su Tu su tu SU tu s U tu s U Tu Su tu TOTAL 2 70 21 4 82 21 13 17 230 Identify the order of the genes on the chromosome:arrow_forward
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