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Authoritative PPT Summary
"Mutation of Biology" PPT
Part One: Review Introduction
What is "biological variation"?
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 examples? Can all mutations be passed on to future generations? Can you give examples?
Biological variation PPT, part 2 content: exploration activities
Exploring the variation in fruit size of two different varieties of peanuts
1. Purpose of activities
1. Explain the reasons for the variation in peanut fruit size through sampling and measurement methods.
2. Use sampling surveys, collect and process data and draw curve graphs to measure and analyze the variation in size of peanut fruits.
3. Through experiments, deepen the understanding of variation, thereby deepening the understanding of things in nature.
Experimental Notes
1. Measure to the nearest millimeter and round to an integer.
2. Fill in the table (1) in P4 of the research activity report booklet. After measuring and recording, determine about ten length ranges (such as 2--4 mm; 5--7 mm; 8--10 mm;...), Calculate the number of peanuts in each range, fill it in P4 table (2), and count the number of peanut fruits in each length range.
3. In P5, draw curves of the large and small varieties of peanuts in different colors (that is, one curve graph has two curves).
Biological variation PPT, the third part: cooperation and communication
1. Compare and see which group of students draws the most beautiful table!
2. What conclusion did you draw by analyzing the distribution table of the number of two peanut fruits in different length ranges?
According to the peak value of the curve appearing in the numerical range corresponding to different abscissas, we can draw the conclusion: ① Due to different varieties, the size of peanut fruit is significantly different; ② The size difference of peanut fruit of the same variety is small.
In conclusion
There are two types of biological variation. One type is caused by genetic material, which is called heritable variation. The other type is caused by the environment and is called non-heritable variation.
Analysis of causes of heritable variation
1. Chromosomal aberrations (including structural and numerical variations)
2. Gene mutation (causes: radiation, chemical mutagens, too high or too low temperature, etc.)
Biological variation PPT, part 4 content: classroom training
1. Ordinary tomatoes and cherry tomatoes belong to the same plant, but their fruit sizes are very different. This phenomenon belongs to _____.
2. The mutation that causes no change in _____ substances due to the influence of the external environment is called _____ mutation.
3. Heritable _____ has a significant impact on biological survival and racial reproduction.
4. In crops, poultry and livestock, there are sometimes mutations that are _____ to humans. People select such species and through continuous _____, they can get _____ varieties.
Keywords: Jiangsu Education Edition eighth grade biology PPT courseware for the second volume free download, variation of biology PPT download, .PPT format;
For more information about the "Mutation of Biology" PPT courseware, please click the "Mutation of Biology" ppt tag.
"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 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 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..