Teacher: True. Why are you laughing? (Turning to the whole class rather
seriously and trying to show that it was a serious matter). Yes, it is true. In
such a way reproduction takes place. Otherwise animals cannot be born.
In such a way you will also continue heredity, won’t you? (Laughter).
Pupil: Yes, ejeke. But we need to get married first, ejeke (Laughter).
Teacher: Be serious. You should learn these things. You are now adults.
If you do not learn these concepts, you will remain children. If anyone is
interested to know more about how humans reproduce, you should come
to additional courses in genetics. I will teach those concepts in-depth. If
anyone wants to register for those courses, come after class; I will be here.
Did everyone understand heredity? Now what was the second concept?
Natural selection... What is it? Who can tell me? (Three pupils raised their
hands, but the teacher began explaining it herself).
... Natural selection is when humans and animals struggle for existence.
They choose suitable places to survive and live. All animals and plants that
we have now have survived this struggle. We have many records to show
that many animals and plants did not survive. You should know all these
definitions by heart. You should be able to explain to everyone who asks
you. [Several pupils were talking].
... Artificial selection is when humans select which species should
continue. For example, hybrids such as mules. It is a crossbreed between
horses and donkeys. Mules are very strong, but they cannot reproduce.
Plants can also be grown by artificial selection. For example, Michurin,
a famous Soviet biologist, conducted a lot of experiments with plants.
The idea of crossbreeding of plants was successfully used in agriculture
during the USSR era.
Te a ch e r : Now we have finished the review of the previous lesson materials.
I hope everyone understood. It is important to review and refresh our
memories. Now, write down the new theme for today in your notebooks
(she wrote the plan on the board). Today we will learn the following:
“Classifications of Plants” and “Animals are the Reflections of Evolution”.
Plan:
Classification groups;
Convergatsia (similarities of marks due to similar living conditions);
Principles of modern classifications...