To calculate:
The regression coefficient of mean offspring length against mean parental length and also to estimate the narrow-sense heritability for the trait.
Introduction:
The regression line is mathematically expressed as follows:
Here, y is the mean offspring length of the middle joint of right index finger.
Explanation of Solution
Regression coefficient
Here,
xi | yi | |||||
30 | 31 | -1.7 | -1.4 | 2.89 | 1.96 | 2.38 |
35 | 36 | 3.3 | 3.6 | 10.89 | 12.96 | 11.88 |
28 | 31 | -3.7 | -1.4 | 13.69 | 1.96 | 5.18 |
33 | 35 | 1.3 | 2.6 | 1.69 | 6.76 | 3.38 |
26 | 27 | -5.7 | -5.4 | 32.49 | 29.16 | 30.78 |
32 | 30 | 0.3 | -2.4 | 0.09 | 5.76 | -0.72 |
31 | 34 | -0.7 | 1.6 | 0.49 | 2.56 | -1.12 |
29 | 28 | -2.7 | -4.4 | 7.29 | 19.36 | 11.88 |
40 | 38 | 8.3 | 5.6 | 68.89 | 31.36 | 46.48 |
33 | 34 | 1.3 | 1.6 | 1.69 | 2.56 | 2.08 |
Total =317 | 324 |
Mean of xi and yi are as follows:
Covariance is calculated as follows:
Now, the variance of x can be calculated as follows:
Now, putting the values of variance and covariance in the formula of the regression coefficient as follows:
The value of the regression coefficient is 0.80 and the narrow-sense heritability is equal to the regression coefficient. So, narrow-sense heritability is also 0.80.
The value of the regression coefficient and narrow-sense heritability is 0.80.
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Chapter 24 Solutions
Solutions and Problem-Solving Manual to Accompany Genetics: A Conceptual Approach
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