Concept explainers
In a line of cherry tomatoes, the average fruit weight is
a. What is the selection differential (S) for fruit weight in each cross?
b. If narrow sense heritability
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Genetic Analysis: An Integrated Approach (3rd Edition)
- Orchids come in an amazing variety of colours. Scientists found that cloned Cattleya orchids have a phenotypic variance of 14, while wild Cattleya orchids have a phenotypic variance of 29. What is the broad-sense heritability of these orchids?arrow_forwardLeaf color and stem length in a certain species of diploid flowers are controlled separately by the R and S locus. The R allele (dominant) results in red leaves while r results in yellow leaves. S (dominant) results in short stems and s results in long stems. A cross is performed between a true breeding long-stemmed red plant and a true breeding short- stemmed yellow plant. a. What is the genotype and phenotype of the resulting F1 plants? b. The resulting F1 plants are crossed with long-stemmed plants with yellow leaves. 100 offspring are collected from this cross, and the following phenotype counts are observed. phenotype long red short red count 43 8 long yellow short yellow 40 What are the corresponding genotypes for each of the four classes of the offspring from this cross? c. Using the information above, determine the genotype of the gametes contributed by "parent A" to each of the resulting offspring. Label the gamete types as parental or nonparental.arrow_forwardConsider a true-breeding plant, AABBCC, crossed with another truebreeding plant, aabbcc, whose resulting offspring are AaBbCc. If you cross the F1 generation, and independent assortment is operational, the expected fraction of offspring in each phenotypic class is given by the expression N!/M!(N - M)! where N is the total number of alleles (six in this example) and M is the number of uppercase alleles. In a cross of AaBbCc * AaBbCc, what proportion of the offspring would be expected to contain two uppercase alleles?arrow_forward
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- From a presumed testcross of 2 plants of genotype Aa x aa (in which A represents red and a represents white petals on a plant) we get 5000 red petal plants, and 5400 white petals plants. Using the Chi-squared test, what chi-squared value do we get for this?arrow_forwardTwo pure-breeding lines of petunia plants are crossed. Line 1 plants grow to a height of 54 cm, and Line 2 plants grow to a height of 18 cm. Petunia plant height is controlled by three genes, A, B and C. Line 1 has the genotype A₁A₁B₁B₁C₁C₁, and line 2 has the genotype A2A2B₂B₂C₂C₂. Assume that genotype alone determines plant height under ideal growth conditions and that the alleles of the three genes are additive. If the F1 plants are self crossed, what is the expected proportion of F2 plants with the genotype A₁A₁B₁B₁C₁C₁ 1/8 1/32 1/16 1/4 1/64arrow_forwardA pea plant believed to be heterozygous was selfed and produced pods with the followingphenotypes: 26 constricted yellow73 constricted green83 inflated yellow251 inflated green a. Using the letters A and B, assign alleles to the different traits.b. Determine whether the ratio of pea pods support the hypothesis that the plant isheterozygous.arrow_forward
- PBIKE GU IKE GU Assume that a cross is made between a heterozygous tall pea plant and a s short pea plant. Fifty ofte GOR ano 582 produced in the following frequency: 30 = tall, 20 = s a) What frequency of tall and short plants is expected? b) To test the goodness of fit between the observed and expected values, provide the needed statement of the null c) Compute a Chi-square value (Table value is equal to 3.84) associated with the appropriate test of significance. d) How many degrees of freedom are associated with this test of significance? 29056 290582arrow_forwardThe narrow-sense heritability (hN2) for potato weight in a starting population of potato plants is 0.42, and the mean weight is 1.4 pounds. If a breeder crossed plants with average potato weights of 1.9 and 2.1 pounds,respectively, what is the predicted average weight of potatoes fromthe offspring?arrow_forwardIn the shorthorn breed of cattle, The red and white coat colors are codominant with each other with the resulting hit rosagas condition being roan. A breeder has some white, some Roan, and some red cattle (female) And only one round bull (male).  A. What color cow would be bread to the ro bowl to guarantee the best chance of having white offspring? B. What is the probability of a red cow cross with the Roan bull resulting in a white half? explain by using parent and possible offspring genotypes.  C. What is one possible way that the farmer can guarantee having over red offspring by going outside of his breeding stock? Explain by using parent and possible offspring genotypes. arrow_forward
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