Categories
GENETICS LIVING THINGS REPRODUCTION AND DEVELOPMENT

Embryonic Development


We Will follow the development of a fertilized egg from a zygote  to a baby. It’s fascinating to see how a single cell develops  and grows into a complete baby.

check your vocabulary through these introductory questions and follow the power point presentation to check your understanding of the process of development


Embryonic Development

How Does A Zygote develop into An Embryo?

Define the term embryonic development.

The changes from a zygote to a baby.

What will happen to the zygote after fertilization?

It undergoes the process of cleavage.

What is the end result of cleavage?

A  ball of cells called a morula is formed,then changed into a blastula.

 

Categories
LIVING THINGS REPRODUCTION AND DEVELOPMENT

Sexual Reproduction


Sexual reproduction:
Involves two parents.
Results in offspring that are different from either parent.
The genetic variation is due to recombination of chromosomes.
This process involves the fusion of two gametes nuclei (egg& sperm).
Fusion of the sex cell nuclei occurs during fertilization forming the zygote.

Check the details

Categories
GENETICS LIVING THINGS REPRODUCTION AND DEVELOPMENT

Meiotic cell division Meiosis


Facts about meiosis.

Meiosis involves two cell division.
It produces cells that are different from the parent cell. Each cell has .one-half the number of chromosomes as the parent cell.
Meiosis takes place during sexual reproduction, producing sex cells ( eggs & sperms ).
It takes place in the sex organs (ovaries & testes)

Let us explore how meiosis  happens.

Check the power point presentation.

Categories
LIVING THINGS REPRODUCTION AND DEVELOPMENT

MITOSIS (Making New Cells)


Categories
LIVING THINGS MAINTAINING HOMEOSTASIS

Enzymes


Enzymes reduce the activation energy  needed for chemical reaction to occur. Enzymes are involved in all metabolic reaction that sustain life. Examples of these reaction are, digestion, synthesis, respiration,and photosynthesis. Review the power point presentation to see how enzymes work.

Categories
LIVING THINGS MAINTAINING HOMEOSTASIS

Topic:The Biochemical Processes That Maintain Homeostssis


The processes that help all living things obtain the energy they need are photosynthesis  and respiration.  photosynthesis capture the sun light   and use it to combine the inorganic raw materials (carbon dioxide and water)  to form ( the organic compound) glucose and oxygen.the energy that is  stored in the chemical bonds of glucose is released by the process of cellular respiration.The energy is released and again stored in  special molecules called  ATP, the form of energy used by all organisms.

A  link to Wikipedia is provided for more information.  Review the image that show the connection between photosynthesis and cellular respiration.

 Don’t forget to review  the power point presentation below for more info

Categories
MAINTAINING HOMEOSTASIS

THE FEEDBACK MECHANISM


HI ALL, WE ARE GOING TO STUDY TOGETHER THE FEEDBACK MECHANISM, THE PROCESS THAT ALL LIVING THINGS USE TO KEEP A STABLE INTERNAL STATE. WITHOUT THIS PROCESS WE MIGHT GET SICK OR EVEN DIE. YOU WILL BE ABLE TO EXPLORE THIS PROCESS BY FOLLOWING the POWER POINT.

Topic: feedback mechanism (1) 

 

Categories
MAINTAINING HOMEOSTASIS

See homeostasis in action


Homeostasis from roger961
HI ALL, I’M ADDING ANOTHER SLIDE SHOW ABOUT HOMEOSTASIS TO HELP YOU UNDERSTAND THIS PROCESS. JUST IMAGINE IF YOU CAN’T MAINTAIN A NORMAL BODY TEMPERATURE! (BY THE WAY WHAT IS YOUR NORMAL BODY TEMP?)
Categories
MAINTAINING HOMEOSTASIS

The Immune System


The Immune System

Do you know the connection between the immune system and the Coronavirus pandemic? Of course it’s the immune system. Help us fight this contagious viralinfection.You will be able to find out how the immune system protects you from getting sick.

The immune system , consists of  three lines of defense .

Disease-causing organisms like bacteria, viruses, and parasites are examples of antigens; toxins and any other substance that stimulate an immune response.

Check the power point presentation for more information.

 Topic :the-im-system3 (1) (ppt)