Under melcs in science

2. Explain how fossil records, comparative anatomy,
and genetic information provide evidence for
evolution

3. Classify Analogous and Homologous structure
Identify comparative anatomy
Relate the importance of Fossil to evolution

4. Review

5. 1. Data from the fossils
records
2. Biochemistry

6. Motivation

8. Comparative Anatomy
the comparative study of the
body structures of different
species of animals in order to
understand the adaptive
changes they have undergone
in the course of evolution
from common ancestors.

9. Homologous Structure
Structures from different species which have
similar internal framework, position, and
embryonic development are considered to be
homologous. Homologous structures may
perform different functions in the species living
in a different environment, or it may have the
same origin but different functions.

10. Homologous Structure
Here are some examples of
homologous structures: forelimbs
of dogs, birds,
lizards, and whales, which are
structurally the same, but
functionally different

14. Comparative embryology is the
comparison of embryo
development across species.

15. Embryos of different species can have
similarities that are not visible when the
organisms are fully formed. Many of
these similarities are homologous
features. These features provide
evidence that the species are related
through evolution.

16. For example, all vertebrae embryos have
homologous structures called pharyngeal arches,
or gill arches. In fish, these arches develop into
parts of the gills. In mammals, these arches develop
into parts of the ears and jaw.
In general, embryos of related species have more
features in common at earlier stages of
development than they do at later stages.

18. Analogous
Structures of unrelated species may evolve to
look alike, because the structure is adapted to
similar function. Analogous structures have
similar functions but different origin.

19. Examples are wings of birds, bats, and insects
that have the same function but different in
origin.
Analogous

24. Additional Activity
_______1. Homologous perform different
functions in the species living in a different
environment.
_______2. The examples of Analogous structure
are forelimbs of dogs, birds,
lizards, and whales.
Modified True or False: Write true if the statement
is true and if it is false change the underlined word
into the appropriate word to make the statement
true
True
Homologous

25. Additional Activity
_______3. The wings of the bat and the bird is and
example of Homologous.
_______4. Comparative Anatomy is the comparative
study of the body structures of different species of
animals in order to understand the adaptive changes
they have undergone.
_______5. An early stage of development in organisms is
what we called fetus.
Analogous
True
Embryo

26. Give example of Analogous
Structure that you see in
nature.
Practical Application

27. Give a quick summary on what
we have tackled today.

28. Write H if the structures below are homologous and A if
they are analogous, and do this in your activity
notebook.

30. For question number 5, give an example of
Homologous Structure.

32. H
H
A
A

33. In your notebook, Draw 1 example of a
Homologous and Analogous structure that yo
can see in nature.