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Mitosis and Meiosis - Third Preparatory Grade - First Semester
From 72.13 C$ /h
First: Mitosis
✳️ Definition:
It is a cell division that occurs in somatic cells (such as skin and muscle cells), and its purpose is growth and replacement of damaged cells.
🔁 Result:
This results in two perfectly identical cells, each with the same number of chromosomes (46 in humans).
📘 Its importance:
Growth
- Tissue regeneration
Wound healing
🧠 Stages of mitosis:
1. Prophase: Chromosomes begin to appear
2. Metaphase: The chromosomes are aligned in the middle of the cell.
3. Anaphase: The chromosomes separate and move to the ends.
4. Final: Two new nuclei are formed
---
🧪 Second: Meiosis
✳️ Definition:
It is a division that occurs in reproductive cells (eggs and sperm), and its purpose is to reduce the number of chromosomes by half in preparation for reproduction.
🔁 Result:
This results in four asymmetrical cells, each containing half the number of chromosomes (23 in humans).
📘 Its importance:
- Production of reproductive cells
Maintaining a constant number of chromosomes in living organisms
- Increase genetic diversity among individuals
🧠 Stages of meiosis:
It consists of two successive divisions:
First division: Reduction in the number of chromosomes
- Second division: Similar to mitosis, to form 4 cells
✳️ Definition:
It is a cell division that occurs in somatic cells (such as skin and muscle cells), and its purpose is growth and replacement of damaged cells.
🔁 Result:
This results in two perfectly identical cells, each with the same number of chromosomes (46 in humans).
📘 Its importance:
Growth
- Tissue regeneration
Wound healing
🧠 Stages of mitosis:
1. Prophase: Chromosomes begin to appear
2. Metaphase: The chromosomes are aligned in the middle of the cell.
3. Anaphase: The chromosomes separate and move to the ends.
4. Final: Two new nuclei are formed
---
🧪 Second: Meiosis
✳️ Definition:
It is a division that occurs in reproductive cells (eggs and sperm), and its purpose is to reduce the number of chromosomes by half in preparation for reproduction.
🔁 Result:
This results in four asymmetrical cells, each containing half the number of chromosomes (23 in humans).
📘 Its importance:
- Production of reproductive cells
Maintaining a constant number of chromosomes in living organisms
- Increase genetic diversity among individuals
🧠 Stages of meiosis:
It consists of two successive divisions:
First division: Reduction in the number of chromosomes
- Second division: Similar to mitosis, to form 4 cells
Extra information
Bring your computer, pen, and notebook.
Location
Online from Egypt
About Me
Dr. Hadeer Habka, Science School, follows the same principle as us 💪🏻♥️ She explains integrated science (physics, chemistry, biology) for all levels (secondary, preparatory, and primary) ✅ Recitation after each lesson ✅ Exams and monitoring of student progress ✅ Continuous review ✅ Comprehensive exams with each unit, and I guarantee you the highest grade in integrated science 😊💯
Education
Bachelor of Science and Education
Helwan University
Very good grade with honors
Master's in Curriculum and Methods of Teaching Science
She has completed numerous Egyptian and international courses and certifications.
Helwan University
Very good grade with honors
Master's in Curriculum and Methods of Teaching Science
She has completed numerous Egyptian and international courses and certifications.
Experience / Qualifications
7 years of experience teaching the integrated science curriculum for all grade levels
(Secondary - Preparatory - Primary)
Explaining and simplifying the curriculum, conducting comprehensive reviews, and administering exams on an ongoing basis.
🌟 Are you looking for a fun way to understand science?
I am Dr. Hadeer Habka, a teacher of the integrated science curriculum for all educational levels, with experience in teaching and laboratories, and with a style that makes science an exciting adventure!
🔬 Why did you choose me?
- By explaining science in a story-based and interactive way that makes the student love the subject.
- I make every scientific experiment a fun moment of discovery
I use visual aids and educational games suitable for each age group.
I have experience in simplifying complex concepts for children and teenagers.
- And I like to incorporate Egyptian heritage into the explanation in an innovative way (like the pharaohs and ancient scientific wonders!)
🎯 The stages I work with:
From elementary to high school, with methods that suit each age group.
📚 The lessons could be:
Online or in person
Individuals or small groups
- Includes explanations, applications, and interactive questions
(Secondary - Preparatory - Primary)
Explaining and simplifying the curriculum, conducting comprehensive reviews, and administering exams on an ongoing basis.
🌟 Are you looking for a fun way to understand science?
I am Dr. Hadeer Habka, a teacher of the integrated science curriculum for all educational levels, with experience in teaching and laboratories, and with a style that makes science an exciting adventure!
🔬 Why did you choose me?
- By explaining science in a story-based and interactive way that makes the student love the subject.
- I make every scientific experiment a fun moment of discovery
I use visual aids and educational games suitable for each age group.
I have experience in simplifying complex concepts for children and teenagers.
- And I like to incorporate Egyptian heritage into the explanation in an innovative way (like the pharaohs and ancient scientific wonders!)
🎯 The stages I work with:
From elementary to high school, with methods that suit each age group.
📚 The lessons could be:
Online or in person
Individuals or small groups
- Includes explanations, applications, and interactive questions
Age
Children (7-12 years old)
Teenagers (13-17 years old)
Adults (18-64 years old)
Seniors (65+ years old)
Student level
Beginner
Intermediate
Advanced
Duration
60 minutes
The class is taught in
English
French
Arabic
Availability of a typical week
(GMT -04:00)
New York
Online via webcam
Mon
Tue
Wed
Thu
Fri
Sat
Sun
00-04
04-08
08-12
12-16
16-20
20-24
48.09 C$ /h
How do the body's systems work together?
- The digestive system: It digests food and converts it into simple nutrients (glucose, amino acids, fatty acids) that reach the blood to nourish the cells.
- The respiratory system: Oxygen enters the body and carbon dioxide exits, ensuring the continuation of cellular respiration within the cells.
- The circulatory system (heart and blood vessels): It transports food and oxygen to all parts of the body, and removes waste products such as carbon dioxide and urea.
- The excretory system (kidneys and skin): gets rid of waste products resulting from vital processes such as urine and sweat, in order to maintain the body's internal balance.
- The nervous system: It regulates the functioning of different organs and sends signals to control movement and respond to external stimuli.
- Muscular and skeletal system: Provides movement and support for the body, and helps protect internal organs.
- The immune system: It defends the body against microbes and foreign substances, thus maintaining health.
Summary
Each system has a specific function, but the integration of these systems is what ensures human survival. Digestion provides food, respiration provides oxygen, blood circulation delivers both to the cells, excretion removes waste, and the nervous system coordinates all of this.
- The digestive system: It digests food and converts it into simple nutrients (glucose, amino acids, fatty acids) that reach the blood to nourish the cells.
- The respiratory system: Oxygen enters the body and carbon dioxide exits, ensuring the continuation of cellular respiration within the cells.
- The circulatory system (heart and blood vessels): It transports food and oxygen to all parts of the body, and removes waste products such as carbon dioxide and urea.
- The excretory system (kidneys and skin): gets rid of waste products resulting from vital processes such as urine and sweat, in order to maintain the body's internal balance.
- The nervous system: It regulates the functioning of different organs and sends signals to control movement and respond to external stimuli.
- Muscular and skeletal system: Provides movement and support for the body, and helps protect internal organs.
- The immune system: It defends the body against microbes and foreign substances, thus maintaining health.
Summary
Each system has a specific function, but the integration of these systems is what ensures human survival. Digestion provides food, respiration provides oxygen, blood circulation delivers both to the cells, excretion removes waste, and the nervous system coordinates all of this.
What are microbes?
Microbes are microscopic organisms that cannot be seen with the naked eye; some are beneficial and some are harmful.
- They are found in the air, water, soil, and on the bodies of living organisms.
🔬 Types of microbes
Viruses: The smallest living organisms, they cause diseases such as influenza and AIDS.
- Bacteria: Some are beneficial (such as yogurt bacteria), and some are harmful (such as typhoid bacteria).
- Fungi: such as yeast used in bread making, including harmful ones like a fungus that causes skin diseases.
- Protozoa: such as amoebas that cause dysentery.
🌍 Where it is found
- In the soil, water, and air.
- Inside the bodies of living organisms and on their surface.
✅ Benefits of microbes
- Production of some medicines, such as penicillin, from fungi.
- Manufacturing foods such as yogurt and cheese using beneficial bacteria.
- Analysis of organic matter and restoration of elements to the soil.
⚠️ The dangers of microbes
- It causes serious diseases such as: typhoid, dysentery, influenza.
Food spoils when it grows on it.
🛡️ Ways to prevent microbes
- Wash your hands thoroughly before and after eating.
- Keep food in the refrigerator.
- Boil or sterilize the water before drinking.
- Getting vaccinated against diseases
Microbes are microscopic organisms that cannot be seen with the naked eye; some are beneficial and some are harmful.
- They are found in the air, water, soil, and on the bodies of living organisms.
🔬 Types of microbes
Viruses: The smallest living organisms, they cause diseases such as influenza and AIDS.
- Bacteria: Some are beneficial (such as yogurt bacteria), and some are harmful (such as typhoid bacteria).
- Fungi: such as yeast used in bread making, including harmful ones like a fungus that causes skin diseases.
- Protozoa: such as amoebas that cause dysentery.
🌍 Where it is found
- In the soil, water, and air.
- Inside the bodies of living organisms and on their surface.
✅ Benefits of microbes
- Production of some medicines, such as penicillin, from fungi.
- Manufacturing foods such as yogurt and cheese using beneficial bacteria.
- Analysis of organic matter and restoration of elements to the soil.
⚠️ The dangers of microbes
- It causes serious diseases such as: typhoid, dysentery, influenza.
Food spoils when it grows on it.
🛡️ Ways to prevent microbes
- Wash your hands thoroughly before and after eating.
- Keep food in the refrigerator.
- Boil or sterilize the water before drinking.
- Getting vaccinated against diseases
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