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"Mutation of Biology" PPT courseware
Part I: Biological variation phenomena:
There are always more or less differences between parents and offspring of organisms, as well as between individuals of offspring. This is the phenomenon of biological variation.
Thinking: What is the reason why organisms mutate?
Case Analysis:
1Determined by genetic material
2. Identical twin brothers, the elder brother works outdoors for a long time, and the younger brother works indoors for a long time. After a few years, the elder brother becomes darker than the younger brother;
Caused by different environments
Thought tips: What are the causes of their mutations?
Can both mutations be passed on to future generations?
Part 2: The significance of biological variation to the survival and development of organisms
It is precisely because of the inheritance and variation of organisms that the biological world continues to evolve and develop from simple to complex, from low to high. At the same time, because the environment on the earth is complex, diverse and constantly changing, organisms cannot adapt to the changing environment without mutation.
Biological variation provides raw material for biological evolution.
Part 3: Practice:
1. As the saying goes: "A tree bears fruit, which is both sour and sweet." This shows that organisms have ( ).
A adaptability B stress C genetic D variability
2. South Korea’s rising star Ho Ri-soo successfully underwent sex reassignment surgery, turning him from a man into a pretty girl. What do you think of this change? ( )
A A heritable variation B A change in the genetic structure within the cell C A non-heritable variation D A change in the number of chromosomes within the cell
3. Influenza viruses continue to produce new mutations and become increasingly resistant to cold medicines. This is for humans ( )
A Favorable variation B Unfavorable variation
C Virus degradation D Due to medication
4. The internal factors of biological evolution are ( )
A produces an adverse mutation B produces a non-heritable mutation
C has produced a heritable variation D has produced a favorable variation
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"Mutation of Biology" PPT courseware:
"Mutation of Biology" PPT Courseware Part One: The Phenomenon of Biological Mutation: There are always more or less differences between the parents and offspring of an organism, as well as between individuals of the offspring. This is the phenomenon of biological variation. Thinking: What is the reason why organisms mutate?...
"Mutation of Biology" PPT:
"Mutation of Biology" PPT Part One: Review Introduction What is mutation of biology? It refers to the differences between parents and offspring. Is variation a common phenomenon in the biological world? Can you give some examples? Can variation be inherited? Can you give an example...
"Mutation of Biology" PPT Courseware on Biological Inheritance and Variation 6:
"Variation of Biology" PPT Courseware 6 on Biological Inheritance and Variation Analysis and Discussion Questions: P45 Exercise 3 Treating beet seedlings with a chemical agent can double the number of chromosomes in the cells. Such beets have high sugar content. Do you think this Can this variation be inherited? why..