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In a cross of two pure-breeding lines of tomatoes producing different fruit sizes, the variance in grams (g) of fruit weight in the
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- The 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_forwardThe leaf width of a particular plant has an environmental variance of 2.3 cm, an epistatic variance of4.8 cm, a dominance variance of 1.6 cm, and an additive variance of 3.8 cm. Determine, and interpret,the broad sense and narrow sense heritability.arrow_forwardThe mean and variance of Corolla length in two highly strains of tabacco and their progeny are shown in the following table and one parent (P1) have a short corolla the other parent (P2) have a long corolla calculate the broad sense heritability (H) corolla length in the plant Strain mean (mm). Variance (mm) P1 short 40.47. 3.12 P2 long. 93.75. 3.87 F1 (P1×P2). 63.90 4.74 F2(F1×F2). 68.72. 47.76arrow_forward
- For many students, calculating the chi square value is the most challenging part of conducting a chi square test so it is important to practice. Consider the following information: An F1 tall, round seed pea plant is crossed with a dwarf, wrinkled seed pea plant. The following offspring are observed: Tall, round: 510 Tall, wrinkled: 495 Dwarf, round: 490 Dwarf, wrinkled: 505 a. What is the expected phenotype ratio? #:# or #:#:#:#, depending on what you think the answer is. b. What is the calculated chi-square value? Format your answer with 1 significant digit (i.e. 0.#). c. What is the critical chi-square value from the table provided in the book at the P=0.05 level of significance? Enter the number exactly as shown in this table.arrow_forwardTwo loci contribute to eyelash length in angora rabbits (locus A and B). Assuming additive genetic variance and disregarding environmental effects, you determine that the following alleles contribute the following values to the total expression of lash length (in cm) A = 2.3, a=1.5, B=2.4, b=1.7 What would the phenotype of a rabbit with a genotype of AABb be? _________cmarrow_forwardThe mean and standard deviation of plant height from two rice plants (P1 and P2) and their progeny (F1 and F2) and a backcross generation (P1 x F1) are shown below. Compare the sample variances of P1 and P2. Account for any differences. Similarly, compare the sample variances of the F1 and F2 generations, and account for any differences. Give the possible causes of variation in each generation.arrow_forward
- A wide-ranging survey of Nicotonia growing in its natural environment recorded a variation in corolla length ranging from 12mm to 47mm with a variance of 36.5. Subsequently, collected seeds were grown in a greenhouse and it was found that the range was now very much lower with most plants having similar corolla lengths and the variance was now only 8.4. ALL WORKING MUST BE SHOWN a) What is the heritability of corolla length?arrow_forwardA wide-ranging survey of Nicotonia growing in its natural environment recorded a variation in corolla length ranging from 12mm to 47mm with a variance of 36.5. Subsequently, collected seeds were grown in a greenhouse and it was found that the range was now very much lower with most plants having similar corolla lengths and the variance was now only 8.4. What is the heritability of corolla length?arrow_forwardTomato plants with the same genotype grown in a nearly uniform environment like a greenhouse will probably show broad sense heritability for fruit size than the same plants grown in a more heterogeneous environment such as in an outdoor field. O higher O lower the same (because heritability is a fixed attribute of a given trait) Incorrect Broad sense heritability is the proportion of total phenotypic variance due to genetic factors (as opposed to environmental factors). Do you think this will be the same under all environmental conditions? X Xarrow_forward
- An investigation of shrew tail length showed that the length of tails varied from 24mm to 66mm. In one generation recorded out of a population of 2,360 shrews only 2 were as long as 66mm. In another cross a new true-breeding shrew variety was used which gave a range of F1 tail lengths with a variance of 0.316. In the crosses using the original variety there was an even greater range of tail lengths and a variance of 0.725. What can you conclude about the heritability (H2) of tail length in the original shrews?arrow_forwardAn investigation of shrew tail length showed that the length of tails varied from 24mm to 66mm. In one generation recorded out of a population of 2,360 shrews only 2 were as long as 66mm. In another cross a new true-breeding shrew variety was used which gave a range of F1 tail lengths with a variance of 0.316. In the crosses using the original variety there was an even greater range of tail lengths and a variance of 0.725. Will further artificial selection be a useful way to change shrew tail length?arrow_forwardThe broad-sense heritability of a trait is estimated at 0.6. If the total phenotypic variance is estimated at 30.0, what is the genetic variance? 12 18 36 5 9arrow_forward
- Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning