. The following quote is from Mallet J (2006) What does Drosophila genetics tell us about speciation? Trends in Ecology & Evolution 21:386-393
“Studies [in] Drosophila have given insight into the genetic changes that result in reproductive isolation. Here, I survey some extraordinary and important advances in Drosophila speciation research. However, ‘reproductive isolation’ is not the same as ‘speciation’, and this Drosophila work has resulted in a lopsided view of speciation.”
Focus in on the last sentence in this quote and answer the following questions:
a. What is speciation? (4 points)
b. What is reproductive isolation? (4 points)
c. Define species according to the Biological Species Concept (BSC). (4 points)
d. Given the BSC, what does the author mean that speciation and reproductive isolation are not synonymous? (4 points)
e. In any event, species concepts are difficult to deal with. The definitions we have for species do not often work for all species. Give an example of how the Biological Species Concept “breaks down” in some cases. (4 points)
In: Biology
Consider a portion of monthly return data (In %) on 20-year Treasury Bonds from 2006–2010.
| Date | Return |
| Jan-06 | 4.12 |
| Feb-06 | 4.44 |
| Mar-06 | 4.02 |
| Apr-06 | 4.79 |
| May-06 | 4.01 |
| Jun-06 | 3.65 |
| Jul-06 | 4.07 |
| Aug-06 | 4.3 |
| Sep-06 | 5.49 |
| Oct-06 | 3.6 |
| Nov-06 | 4.71 |
| Dec-06 | 3.83 |
| Jan-07 | 4.14 |
| Feb-07 | 3.53 |
| Mar-07 | 3.68 |
| Apr-07 | 4.19 |
| May-07 | 3.34 |
| Jun-07 | 3.51 |
| Jul-07 | 3.48 |
| Aug-07 | 3.68 |
| Sep-07 | 4.96 |
| Oct-07 | 3.42 |
| Nov-07 | 4.17 |
| Dec-07 | 4.25 |
| Jan-08 | 5.05 |
| Feb-08 | 3.23 |
| Mar-08 | 5.34 |
| Apr-08 | 5.15 |
| May-08 | 4.58 |
| Jun-08 | 4.61 |
| Jul-08 | 4.25 |
| Aug-08 | 4.49 |
| Sep-08 | 3.55 |
| Oct-08 | 4.48 |
| Nov-08 | 4.38 |
| Dec-08 | 3.99 |
| Jan-09 | 3.73 |
| Feb-09 | 5 |
| Mar-09 | 3.2 |
| Apr-09 | 3.87 |
| May-09 | 5.5 |
| Jun-09 | 4.6 |
| Jul-09 | 3.79 |
| Aug-09 | 3.73 |
| Sep-09 | 5.35 |
| Oct-09 | 4.24 |
| Nov-09 | 3.86 |
| Dec-09 | 5.38 |
| Jan-10 | 3.61 |
| Feb-10 | 4.59 |
| Mar-10 | 4.22 |
| Apr-10 | 3.42 |
| May-10 | 4.54 |
| Jun-10 | 5.49 |
| Jul-10 | 4.29 |
| Aug-10 | 4.49 |
| Sep-10 | 3.78 |
| Oct-10 | 3.98 |
| Nov-10 | 3.44 |
| Dec-10 | 5.19 |
Estimate a linear trend model with seasonal dummy variables to make forecasts for the first three months of 2011. (Round intermediate calculations to at least 4 decimal places and final answers to 2 decimal places.)
| Year | Month | y^t |
| 2011 | Jan | |
| 2011 | Feb | |
| 2011 | Mar | |
In: Statistics and Probability
In: Finance
This is a tableau question.
| Year | Sales |
| 2005 | 49387 |
| 2006 | 53412 |
| 2007 | 56783 |
| 2008 | 58436 |
| 2009 | 59994 |
| 2010 | 61515 |
| 2011 | 63182 |
| 2012 | 67989 |
| 2013 | 70448 |
| 2014 | 72601 |
| 2015 | 75482 |
| 2016 | 78341 |
| 2017 | 81111 |
| 2018 | 82517 |
| 2019 | 83275 |
| 2020 | 84005 |
I. (a) Determine the trend line using both linear and two nonlinear equations Hint: You can choose any two of the nonlinear options in edit trend lines within Tableau. (b) Write down the equations (coefficients). Hint: Double click on trend line and click on describe the model.
II. Which trend line would you suggest? Why?
III. Estimate the sales for 2022. Does this seem like a reasonable estimate based on historical data? (Hint: Show Me — first icon on the left hand side)
IV. Check the quality of the forecast prepared by Tableau. Also, Provide Mean Absolute Error (MAE), and the Mean Absolute Percentage Error (MAPE). Hint: one click on forecast area with the right button of your mouse, then describe forecast and check first Summary and later Models.
V. Prepare a dashboard with 4 sheets: Sheet 1 for the trend line using linear function, Sheet 2 for the trend line using one of the nonlinear function of your choice, Sheet 3 for the trend line using another nonlinear function of your preference and Sheet 4 for Forecasting.
In: Statistics and Probability
1. The Russian ex-FSB officer Alexander Litvinenko was poisoned in 2006 with 10 µg of polonium-210, an α emitter that kills through radiation poisoning as molecules important to metabolism are ionized by the passage of the α particles. He died 3 weeks later.
(a) (5 pts) What is the nuclear decay process and what is the Q of the reaction in MeV? Show the full calculation.
(b) (5 pts) Find the kinetic energies (in MeV) of the α particle and the accompanying nucleus.
2. Refer to the previous problem.
(a) (3 pts) What was the initial activity of this dose of Po-210 in decays/sec?
(b) (3 pts) What fraction of the Po-210 sample decayed in the first 3 weeks?
(c) (2 pts) How many α particles were emitted in the first 3 weeks?
(d) (2 pts) If the average ionization energy of molecules in body cells is 2 eV, approximately how many molecules were ionized in the first 3 weeks?
In: Physics
Ramzi corp. issued $6,000,000 of 8% debentures on May 1, 2006 and received cash totaling $5,323,577. The bonds pay interest semiannually on May 1 and November 1. The maturity date on these bonds is November 1, 2014. The firm uses the effective-interest method of amortizing discounts and premiums. The bonds were sold to yield an effective-interest rate of 10%.
Calculate the amount of discount amortization during the first year (5/1/06 through 4/30/07) these bonds were outstanding. (round to the nearest dollar.)
| a. |
discount amortization is $ 53,067 |
|
| b. |
discount amortization is $ 52,067 |
|
| c. |
discount amortization is $ 52,667 |
|
| d. |
discount amortization is $ 53,667 |
In: Accounting
In: Finance
In: Finance
In: Finance
Balance Sheet as at year end 31st Dec
|
2005 |
2006 |
2007 |
2008 |
2009 |
|
|
CAPITAL AND |
|||||
|
LIABILITIES: |
|||||
|
Equity share capital |
400,000 |
600,000 |
500,000 |
400,000 |
600,000 |
|
Long term loan |
500,000 |
250,000 |
300,000 |
400,000 |
300,000 |
|
Sundry creditors |
200,000 |
300,000 |
350,000 |
340,000 |
250,000 |
|
Short term loan |
50,000 |
40,000 |
60,000 |
115,000 |
50,000 |
|
ASSETS: |
|||||
|
Land and Building |
300,000 |
500,000 |
600,000 |
700,000 |
450,000 |
|
Furniture |
600,000 |
450,000 |
400,000 |
400,000 |
500,000 |
|
Cash at bank |
50,000 |
60,000 |
70,000 |
50,000 |
70,000 |
|
Stock |
140,000 |
150,000 |
100,000 |
80,000 |
120,000 |
|
Prepaid expenses |
60,000 |
30,000 |
40,000 |
25,000 |
60,000 |
You are required to carry out the following analyses;
Common size balance sheet for the five years. and interpret. (5 marks
In: Accounting