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Authoritative PPT Summary
"Human Traits and Heredity" PPT
Part One: Observation and Thinking
Which of the following traits are the same as your father? Which ones are the same as your mother?
1. Do the ears have earlobes?
2. Can you curl your tongue from both sides to the center?
3. Can you bend your thumb dorsally?
Situation import
Looking at the father and son and the twins in the picture, can you tell what are the similarities and differences between them?
learning target
1. List common genetic traits in the human body.
2. Give examples of relative characteristics of living things.
3. Give examples to illustrate that biological traits are controlled by genes.
Human traits and genetics PPT, part 2: Common genetic traits of the human body
1. Common genetic traits in the human body
(1) Single eyelids and double eyelids
Some characteristics of people
(2) Can the tongue be curled from both sides to the middle?
(3) Whether there are dimples
2. Relative traits: different expression types of a genetic trait in the same organism.
Single eyelids and double eyelids (relative characteristics)
With and without earlobes (relative traits)
Practice: determine which ones are not relative?
yellow skin and dark eyes;
double eyelids and big eyes;
thick lips and large mouth;
Aquiline nose and straight nose;
Human Traits and Heredity PPT, Part 3: Genes Control Biological Traits
1. Genes exist in pairs
Dominant and recessive genes
Genes are in pairs, and genes that control biological traits are divided into dominant and recessive genes.
Dominant gene: A gene that controls a dominant trait (indicated by a capital letter)
Recessive genes: genes that control recessive traits (indicated by lowercase letters)
2. Representation methods of genes and traits
The gene that determines earlobes is a dominant gene (D)
The gene that determines the absence of earlobes is a recessive gene (d)
Human Traits and Heredity PPT, Part 4: Class Summary
1. Common genetic traits of the human body
1. Genetic traits: Characteristics of an organism that can be inherited.
2. Relative traits: different expression types of the same genetic trait in the same organism.
2. Genes control biological traits
1. Genes exist in pairs, and genes that control biological traits are divided into dominant and recessive genes.
2. Dominant genes: genes that control dominant traits.
3. Recessive genes: genes that control recessive traits.
Human traits and genetics PPT, part 5: training to meet standards
1. The gene (B) that determines a person to have earlobes is dominant, and the gene (b) that determines the absence of earlobes is recessive. Classmate Xiao Ming has earlobes. Which of the following statements is correct ( )
A. Xiao Ming’s genotype must be type BB
B. Xiao Ming’s parents must both have earlobes.
C. At least one of Xiao Ming’s parents has earlobes.
D. Xiao Ming’s genotype must be type Bb
2. Pure sweet corn and pure non-sweet corn are planted in rows. When harvesting, it is found that there are non-sweet corn kernels on the sweet corn ears, but there are no sweet corn kernels on the non-sweet corn ears. The reason is ( )
A. Sweetness is a dominant trait B. Non-sweetness is a dominant trait
C. Mix with each other D. Select from each other
3. Which of the following are relative traits ( )
A. The tall stems of corn and the short stems of rice B. The long and yellow hairs of rabbits
C. The tall stems and white flowers of peas D. People have normal color vision and color blindness
4. Given the traits of having dimples and not having dimples, if a couple does not have dimples, can the couple give birth to a child with dimples? The gene that determines having dimples (D) is a dominant gene and determines that there are no dimples. The gene (d) is a recessive gene.
⑴Write the genetic composition of a person without dimples: The genetic composition of a person with dimples is:
⑵ If classmate A’s father has dimples and his mother does not, then does classmate A have dimples?
Keywords: Jiangsu Education Edition eighth grade biology PPT courseware for the second volume free download, human traits and heredity PPT download, .PPT format;
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"Human Traits and Heredity" PPT courseware:
Contents of the first part of the PPT courseware "Human Traits and Heredity": Objectives of this section: 1. List the common genetic traits of the human body. 2. Give examples of relative traits of humans. 3. Give examples of traits of living things that are controlled by genes. Teamwork and research are completed. The following content 1. What is...