1. Species Traits Heritability Value Genetically/Environ-
mentally determined
PART A. Procedure for heritability of variable traits within a population :
1. Before beginning this exercise, construct a table where you will record your data. Read
through these instructions first so you will have an idea how your table should look like.
2. Search the Internet for published data on ‘degrees of heritability’ or ‘heritability estimates’.
Notify your teacher (through email or in class) about sites you wish to include in the whitelist.
Take note that inclusion of such sites in the whitelist may not be immediate, thus allot ample
time for research.
3. From the available data, choose three plant species and three animal species. List these in
your data table.
4. For each species, list down three traits and their degree of heritability. Specify whether the
trait is genetically or environmentally determined. A genetically determined trait has a high
heritability value ( 0.5 or 50%), while an environmentally determined trait has a low heritability
value ( 0.50 or 50%). Write these down in your data table as well.

2. Worksheet
1. For the worksheet of this activity, use short bond paper (8.5” X 11”). Note that if you are
printing your work at the library, you will have to provide your own paper since they only have
A4 (8.27” X 11.69”). Your work should be computerized and should include the following
information: section and group number, class number and name of each member, date(s)
performed, and date submitted.
2. The worksheet consists of two parts: (I) the Results Section and (II) the Discussion Section.
I. Results Section: This section should include all the tables that were required of you in this
activity.
II. Discussion Section: Write your answers to the following questions.
1. Compare the heritability of traits between plants and animals.
2. Compare and contrast environmentally determined traits with genetically determined traits.
3. Is evolution by natural selection occurring in the stick population? Explain your answer.
4. Which individuals (green, red, or natural) have the higher fitness? Do the same individuals
have the same fitness in different environments? Explain your answer.