Biology Lesson 6-Evolution of Lif
,Biological Diversity due to evolution
• According to numerous evidences it is suggested that the biologica
diversity represented by the millions of species currently living on o
planet evolved from a single ancestor during Earth’s long history.
• Even the organisms that are different from one another are distant
related, linked through numerous intermediate ancestors to a sing
common ancestor.
• The British naturalist Charles Darwin (1809–1882) developed a
simple, scientifically testable mechanism to explain the relationship
among diversity of organisms
,Evolution
• Evolution can be defined as the accumulation of genetic changes within
populations over time.
• Evolution does not refer to changes that occur in an individual within its
lifetime.
• Instead, it refers to changes in the characteristics of populations over th
course of generations.
• These changes may be minute that they are difficult to detect or so grea
that the population differs noticeably from its ancestral population.
• Eventually, two populations may diverge to such a degree that we refer
them as different species
, Speciation
• a species is a group of organisms, with similar structure, function, a
behavior, that are capable of interbreeding with one another.
,Biological Diversity due to evolution
• According to numerous evidences it is suggested that the biologica
diversity represented by the millions of species currently living on o
planet evolved from a single ancestor during Earth’s long history.
• Even the organisms that are different from one another are distant
related, linked through numerous intermediate ancestors to a sing
common ancestor.
• The British naturalist Charles Darwin (1809–1882) developed a
simple, scientifically testable mechanism to explain the relationship
among diversity of organisms
,Evolution
• Evolution can be defined as the accumulation of genetic changes within
populations over time.
• Evolution does not refer to changes that occur in an individual within its
lifetime.
• Instead, it refers to changes in the characteristics of populations over th
course of generations.
• These changes may be minute that they are difficult to detect or so grea
that the population differs noticeably from its ancestral population.
• Eventually, two populations may diverge to such a degree that we refer
them as different species
, Speciation
• a species is a group of organisms, with similar structure, function, a
behavior, that are capable of interbreeding with one another.
