# Biology problems: statistics, sequence of genes

47. Corn plants from a test plot are measured, and the distribution of heights at 10-cm intervals is recorded below.

(see chart in attached file)

Calculate (a) the mean height, (b) the variance (c) the standard deviation, and (d) standard error of the mean.

48. The genes dumpy wing (dp), clot eye (cl), and apterous wing (ap) are linked on chromosome 2 of Drosophila. In a series of two-point mapping crosses, the following genetic distance were determined:

dp-ap 42

dp-cl 3

ap-cl 39

What is the sequence of three genes?

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#### Solution Preview

47. Corn plants from a test plot are measured, and the distribution of heights at 10-cm intervals is recorded blow.

Height (cm) 100 110 120 130 140 150 160 170 180

Plants (cm) 20 60 90 130 180 120 70 50 40

Calculate (a) the mean height, (b) the variance (c) the standard deviation, and (d) standard error of the mean.

I assume that you mean the number of plants at each height is in the second row:

Height (cm) 100 110 120 130 140 150 160 170 180

Plants 20 60 90 130 180 120 70 50 40

There are 760 total plants. If you multiply each height ...

#### Solution Summary

The solution includes answers and complete explanations to two biology problems. The explanations include how to calculate mean, variance, standard deviation, and standard error and how to determine the sequence of three genes.