LAS general-biology-Mechanisms-of-Evolution 2
Biology (Moscoso-Rios National High School)
, Moscoso-Rios National High School
Villavert-Jimenez Hamtic Antique Quarter 4
Learning Activity Sheets (LAS) No.1
GENERAL BIOLOGY 2
Name of Learner:
Grade & Section: Date:
Mechanisms of Evolution
I. Introductory Concept
GENETIC VARIATION: YOU ARE ‘YOU-NIQUE’
Have you ever wondered why do people look the same, but also look different from
each other? Like how you look like some of your relatives, but still, you are unique
and recognizable. To some extent, even twins may look exactly alike but still, there
will be some traits that will make them different from each other, such as the way
they talk or the way they walk.
No two persons are exactly similar. Hence, no two persons have the same codes of
DNA. This is because as an individual, you carry a unique set of genes. The
differences between the genes of each individual and the differences between genes
of the different populations are termed as GENETIC VARIATION.
GENE FREQUENCY and EVOLUTION
As an individual, you carry a unique gene of traits, so as the other people in the
world. But there are parts of that gene in which you may find similarities with others.
For example, you may be unique because you are the only person with tan skin and
three moles beneath an eye within your community, but you may also be the same
with other people in your community because the majority of you have tan skin.
The number of times at which the common gene appears in everyone within a
population is called GENE FREQUENCY. In a simpler context, gene frequency refers
to how common a specific gene is in a group of specie within a specific area.
You can even solve gene frequency by dividing the actual occurrence of a specific
gene with the total number of populations. It is like solving for the percentage of the
population with a specific common gene.
Any change in the gene frequency of a species or population is EVOLUTION.
Evolution is the change in the genetic materials of organisms, it is a change
manifested in their traits. It is also a change that started deep within the cells of
individuals, in their genes, in their DNA, in their chromosomes.
MECHANISMS OF EVOLUTION: What causes a change in gene frequency?
Gene and the DNA don’t change overnight and don’t change with no cause. There
are various mechanisms that bring forth changes to the gene frequency, let us
investigate and explain them one by one:
1. Artificial Selection
This is also termed as selective breeding. One of the causes of change in the
gene frequency of some species specifically domesticated plants and animals is
artificial selection or selective breeding. It is when humans selectively choose to
1t
breed animals and plants with specific traits that they deemed beneficial for differen
purposes.
Biology (Moscoso-Rios National High School)
, Moscoso-Rios National High School
Villavert-Jimenez Hamtic Antique Quarter 4
Learning Activity Sheets (LAS) No.1
GENERAL BIOLOGY 2
Name of Learner:
Grade & Section: Date:
Mechanisms of Evolution
I. Introductory Concept
GENETIC VARIATION: YOU ARE ‘YOU-NIQUE’
Have you ever wondered why do people look the same, but also look different from
each other? Like how you look like some of your relatives, but still, you are unique
and recognizable. To some extent, even twins may look exactly alike but still, there
will be some traits that will make them different from each other, such as the way
they talk or the way they walk.
No two persons are exactly similar. Hence, no two persons have the same codes of
DNA. This is because as an individual, you carry a unique set of genes. The
differences between the genes of each individual and the differences between genes
of the different populations are termed as GENETIC VARIATION.
GENE FREQUENCY and EVOLUTION
As an individual, you carry a unique gene of traits, so as the other people in the
world. But there are parts of that gene in which you may find similarities with others.
For example, you may be unique because you are the only person with tan skin and
three moles beneath an eye within your community, but you may also be the same
with other people in your community because the majority of you have tan skin.
The number of times at which the common gene appears in everyone within a
population is called GENE FREQUENCY. In a simpler context, gene frequency refers
to how common a specific gene is in a group of specie within a specific area.
You can even solve gene frequency by dividing the actual occurrence of a specific
gene with the total number of populations. It is like solving for the percentage of the
population with a specific common gene.
Any change in the gene frequency of a species or population is EVOLUTION.
Evolution is the change in the genetic materials of organisms, it is a change
manifested in their traits. It is also a change that started deep within the cells of
individuals, in their genes, in their DNA, in their chromosomes.
MECHANISMS OF EVOLUTION: What causes a change in gene frequency?
Gene and the DNA don’t change overnight and don’t change with no cause. There
are various mechanisms that bring forth changes to the gene frequency, let us
investigate and explain them one by one:
1. Artificial Selection
This is also termed as selective breeding. One of the causes of change in the
gene frequency of some species specifically domesticated plants and animals is
artificial selection or selective breeding. It is when humans selectively choose to
1t
breed animals and plants with specific traits that they deemed beneficial for differen
purposes.
