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Title: Variations and Inheritance, Grade 8 Biology
Description: These notes, for students of grade 8, offer a detailed explanation on how organisms are identified through "key making", what is variation and inheritance, what is selective breeding and natural selection. These notes give a clear understanding about the topic of variation and inheritance and can ensure an amazing grade!
Description: These notes, for students of grade 8, offer a detailed explanation on how organisms are identified through "key making", what is variation and inheritance, what is selective breeding and natural selection. These notes give a clear understanding about the topic of variation and inheritance and can ensure an amazing grade!
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Variations and Inheritance, Grade 8 Biology
Written By:- Maria Batool
Table of Content
Variations and Inheritance
In this lesson we will go through:
● What are Keys?
● What is Variation and Inheritance?
What is Variation?
What is Inheritance?
● What is Selective Breeding?
● What is Natural Selection?
● Natural Selection in real life
...
The questions are based on the answers, yes or no
...
● What is Variation and Inheritance?
What is Variation?
A species is a group of organisms that share the same features and can interbreed to
produce a fertile offspring
...
Organisms belonging to a similar species may
have different genes and sometimes the organisms from a species live in different
environments
...
Such as many human beings have different
eye colours because of different genes, sometimes people have a fair or dark
complexion due to their different surroundings
...
The features and
characteristics of an organism are determined by its genes
...
These genes carry a set of instructions for building a new organism
...
Half of genes come from male parents and half from female
parents
...
They are found on
long threads called chromosomes
...
The gene tells the cell how to make a particular substance
...
As we grow,
our cells divide to make more and more cells
...
But how does the first cell
come into being? The first cell was zygote, it was formed when the female gamete
from the mother's egg fuses with male gamete in the father's sperm cell
...
Every cell in a human body has 46 chromosomes, 23 from male parents and 23 from
female parents
...
● What is Selective Breeding?
In selective breeding people choose organisms from a population of organisms that
shows variations
...
● What is Natural Selection?
In natural breeding, there are variations among the individuals belonging to the
population of organisms
...
Only the individuals with best
adaptations survive to breed
...
● Natural Selection in real life
...
Have you ever noticed that when antibiotics are taken for a long time, the
bacteria becomes resistant towards the antibiotics
...
When the bacteria becomes resistant, antibiotics are unable
to cure the disease
Title: Variations and Inheritance, Grade 8 Biology
Description: These notes, for students of grade 8, offer a detailed explanation on how organisms are identified through "key making", what is variation and inheritance, what is selective breeding and natural selection. These notes give a clear understanding about the topic of variation and inheritance and can ensure an amazing grade!
Description: These notes, for students of grade 8, offer a detailed explanation on how organisms are identified through "key making", what is variation and inheritance, what is selective breeding and natural selection. These notes give a clear understanding about the topic of variation and inheritance and can ensure an amazing grade!